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Prime Numbers A prime number has only two different factors. They are 1 and the number itself. 13 is a prime number because the only factors of 13 are 1 and 13. Note that 1 is not a prime number.
The following table lists all odd numbers from 3 to 991 and if the number is not a prime the lowest factor is given. 3 - Prime
| 5 - Prime
| 7 - Prime
| 9 - 3
| 11 - Prime
| 13 - Prime
| 15 - 3
| 17 - Prime
| 19 - Prime
| 21 - 3
| 23 - Prime
| 25 - 5
| 27 - 3
| 29 - Prime
| 31 - Prime
| 33 - 3
| 35 - 5
| 37 - Prime
| 39 - 3
| 41 - Prime
| 43 - Prime
| 45 - 3
| 47 - Prime
| 49 - 7
| 51 - 3
| 53 - Prime
| 55 - 5
| 57 - 3
| 59 - Prime
| 61 - Prime
| 63 - 3
| 65 - 5
| 67 - Prime
| 69 - 3
| 71 - Prime
| 73 - Prime
| 75 - 3
| 77 - 7
| 79 - Prime
| 81 - 3
| 83 - Prime
| 85 - 5
| 87 - 3
| 89 - Prime
| 91 - 7
| 93 - 3
| 95 - 5
| 97 - Prime
| 99 - 3
| 101 - Prime
| 103 - Prime
| 105 - 3
| 107 - Prime
| 109 - Prime
| 111 - 3
| 113 - Prime
| 115 - 5
| 117 - 3
| 119 - 7
| 121 - 11
| 123 - 3
| 125 - 5
| 127 - Prime
| 129 - 3
| 131 - Prime
| 133 - 7
| 135 - 3
| 137 - Prime
| 139 - Prime
| 141 - 3
| 143 - 11
| 145 - 5
| 147 - 3
| 149 - Prime
| 151 - Prime
| 153 - 3
| 155 - 5
| 157 - Prime
| 159 - 3
| 161 - 7
| 163 - Prime
| 165 - 3
| 167 - Prime
| 169 - 13
| 171 - 3
| 173 - Prime
| 175 - 5
| 177 - 3
| 179 - Prime
| 181 - Prime
| 183 - 3
| 185 - 5
| 187 - 11
| 189 - 3
| 191 - Prime
| 193 - Prime
| 195 - 3
| 197 - Prime
| 199 - Prime
| 201 - 3
| 203 - 7
| 205 - 5
| 207 - 3
| 209 - 11
| 211 - Prime
| 213 - 3
| 215 - 5
| 217 - 7
| 219 - 3
| 221 - 13
| 223 - Prime
| 225 - 3
| 227 - Prime
| 229 - Prime
| 231 - 3
| 233 - Prime
| 235 - 5
| 237 - 3
| 239 - Prime
| 241 - Prime
| 243 - 3
| 245 - 5
| 247 - 13
| 249 - 3
| 251 - Prime
| 253 - 11
| 255 - 3
| 257 - Prime
| 259 - 7
| 261 - 3
| 263 - Prime
| 265 - 5
| 267 - 3
| 269 - Prime
| 271 - Prime
| 273 - 3
| 275 - 5
| 277 - Prime
| 279 - 3
| 281 - Prime
| 283 - Prime
| 285 - 3
| 287 - 7
| 289 - 17
| 291 - 3
| 293 - Prime
| 295 - 5
| 297 - 3
| 299 - 13
| 301 - 7
| 303 - 3
| 305 - 5
| 307 - Prime
| 309 - 3
| 311 - Prime
| 313 - Prime
| 315 - 3
| 317 - Prime
| 319 - 11
| 321 - 3
| 323 - 17
| 325 - 5
| 327 - 3
| 329 - 7
| 331 - Prime
| 333 - 3
| 335 - 5
| 337 - Prime
| 339 - 3
| 341 - 11
| 343 - 7
| 345 - 3
| 347 - Prime
| 349 - Prime
| 351 - 3
| 353 - Prime
| 355 - 5
| 357 - 3
| 359 - Prime
| 361 - 19
| 363 - 3
| 365 - 5
| 367 - Prime
| 369 - 3
| 371 - 7
| 373 - Prime
| 375 - 3
| 377 - 13
| 379 - Prime
| 381 - 3
| 383 - Prime
| 385 - 5
| 387 - 3
| 389 - Prime
| 391 - 17
| 393 - 3
| 395 - 5
| 397 - Prime
| 399 - 3
| 401 - Prime
| 403 - 13
| 405 - 3
| 407 - 11
| 409 - Prime
| 411 - 3
| 413 - 7
| 415 - 5
| 417 - 3
| 419 - Prime
| 421 - Prime
| 423 - 3
| 425 - 5
| 427 - 7
| 429 - 3
| 431 - Prime
| 433 - Prime
| 435 - 3
| 437 - 19
| 439 - Prime
| 441 - 3
| 443 - Prime
| 445 - 5
| 447 - 3
| 449 - Prime
| 451 - 11
| 453 - 3
| 455 - 5
| 457 - Prime
| 459 - 3
| 461 - Prime
| 463 - Prime
| 465 - 3
| 467 - Prime
| 469 - 7
| 471 - 3
| 473 - 11
| 475 - 5
| 477 - 3
| 479 - Prime
| 481 - 13
| 483 - 3
| 485 - 5
| 487 - Prime
| 489 - 3
| 491 - Prime
| 493 - 17
| 495 - 3
| 497 - 7
| 499 - Prime
| 501 - 3
| 503 - Prime
| 505 - 5
| 507 - 3
| 509 - Prime
| 511 - 7
| 513 - 3
| 515 - 5
| 517 - 11
| 519 - 3
| 521 - Prime
| 523 - Prime
| 525 - 3
| 527 - 17
| 529 - 23
| 531 - 3
| 533 - 13
| 535 - 5
| 537 - 3
| 539 - 7
| 541 - Prime
| 543 - 3
| 545 - 5
| 547 - Prime
| 549 - 3
| 551 - 19
| 553 - 7
| 555 - 3
| 557 - Prime
| 559 - 13
| 561 - 3
| 563 - Prime
| 565 - 5
| 567 - 3
| 569 - Prime
| 571 - Prime
| 573 - 3
| 575 - 5
| 577 - Prime
| 579 - 3
| 581 - 7
| 583 - 11
| 585 - 3
| 587 - Prime
| 589 - 19
| 591 - 3
| 593 - Prime
| 595 - 5
| 597 - 3
| 599 - Prime
| 601 - Prime
| 603 - 3
| 605 - 5
| 607 - Prime
| 609 - 3
| 611 - 13
| 613 - Prime
| 615 - 3
| 617 - Prime
| 619 - Prime
| 621 - 3
| 623 - 7
| 625 - 5
| 627 - 3
| 629 - 17
| 631 - Prime
| 633 - 3
| 635 - 5
| 637 - 7
| 639 - 3
| 641 - Prime
| 643 - Prime
| 645 - 3
| 647 - Prime
| 649 - 11
| 651 - 3
| 653 - Prime
| 655 - 5
| 657 - 3
| 659 - Prime
| 661 - Prime
| 663 - 3
| 665 - 5
| 667 - 23
| 669 - 3
| 671 - 11
| 673 - Prime
| 675 - 3
| 677 - Prime
| 679 - 7
| 681 - 3
| 683 - Prime
| 685 - 5
| 687 - 3
| 689 - 13
| 691 - Prime
| 693 - 3
| 695 - 5
| 697 - 17
| 699 - 3
| 701 - Prime
| 703 - 19
| 705 - 3
| 707 - 7
| 709 - Prime
| 711 - 3
| 713 - 23
| 715 - 5
| 717 - 3
| 719 - Prime
| 721 - 7
| 723 - 3
| 725 - 5
| 727 - Prime
| 729 - 3
| 731 - 17
| 733 - Prime
| 735 - 3
| 737 - 11
| 739 - Prime
| 741 - 3
| 743 - Prime
| 745 - 5
| 747 - 3
| 749 - 7
| 751 - Prime
| 753 - 3
| 755 - 5
| 757 - Prime
| 759 - 3
| 761 - Prime
| 763 - 7
| 765 - 3
| 767 - 13
| 769 - Prime
| 771 - 3
| 773 - Prime
| 775 - 5
| 777 - 3
| 779 - 19
| 781 - 11
| 783 - 3
| 785 - 5
| 787 - Prime
| 789 - 3
| 791 - 7
| 793 - 13
| 795 - 3
| 797 - Prime
| 799 - 17
| 801 - 3
| 803 - 11
| 805 - 5
| 807 - 3
| 809 - Prime
| 811 - Prime
| 813 - 3
| 815 - 5
| 817 - 19
| 819 - 3
| 821 - Prime
| 823 - Prime
| 825 - 3
| 827 - Prime
| 829 - Prime
| 831 - 3
| 833 - 7
| 835 - 5
| 837 - 3
| 839 - Prime
| 841 - 29
| 843 - 3
| 845 - 5
| 847 - 7
| 849 - 3
| 851 - 23
| 853 - Prime
| 855 - 3
| 857 - Prime
| 859 - Prime
| 861 - 3
| 863 - Prime
| 865 - 5
| 867 - 3
| 869 - 11
| 871 - 13
| 873 - 3
| 875 - 5
| 877 - Prime
| 879 - 3
| 881 - Prime
| 883 - Prime
| 885 - 3
| 887 - Prime
| 889 - 7
| 891 - 3
| 893 - 19
| 895 - 5
| 897 - 3
| 899 - 29
| 901 - 17
| 903 - 3
| 905 - 5
| 907 - Prime
| 909 - 3
| 911 - Prime
| 913 - 11
| 915 - 3
| 917 - 7
| 919 - Prime
| 921 - 3
| 923 - 13
| 925 - 5
| 927 - 3
| 929 - Prime
| 931 - 7
| 933 - 3
| 935 - 5
| 937 - Prime
| 939 - 3
| 941 - Prime
| 943 - 23
| 945 - 3
| 947 - Prime
| 949 - 13
| 951 - 3
| 953 - Prime
| 955 - 5
| 957 - 3
| 959 - 7
| 961 - 31
| 963 - 3
| 965 - 5
| 967 - Prime
| 969 - 3
| 971 - Prime
| 973 - 7
| 975 - 3
| 977 - Prime
| 979 - 11
| 981 - 3
| 983 - Prime
| 985 - 5
| 987 - 3
| 989 - 23
| 991 - Prime
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See also: Composite Number, Eratosthenes, Mersenne Prime, Relatively Prime, Sieve of Eratosthenes, Twin Primes.
  
Subjects:- Mathematics
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