## Answer

###### Wiki User

###### 11/15/2015

The formal definition of a prime number is an integer which has exactly two unique natural number factors. Though this may seem like gibberish, its true meaning is any number which has only two positive factors, but both factors must be different. Generally this means that the factors of a prime number are itself and one. Take 13 for instance. No two whole numbers multiply to get 13 except 1 and 13. 2 is the only even prime number because all other prime numbers are divisible by 2. 1 is not a prime number because it only has one unique factor: 1.

Prime numbers are defined by the characteristic of only being divisible by 1 and itself.

2 3 5 7 11 13 17 19 23 29

31 37 41 43 47 53 59 61 67 71

73 79 83 89 97 101 103 107 109 113

127 131 137 139 149 151 157 163 167 173

179 181 191 193 197 199 211 223 227 229

233 239 241 251 257 263 269 271 277 281

283 293 307 311 313 317 331 337 347 349

353 359 367 373 379 383 389 397 401 409

419 421 431 433 439 443 449 457 461 463

467 479 487 491 499 503 509 521 523 541

547 557 563 569 571 577 587 593 599 601

607 613 617 619 631 641 643 647 653 659

661 673 677 683 691 701 709 719 727 733

739 743 751 757 761 769 773 787 797 809

811 821 823 827 829 839 853 857 859 863

877 881 883 887 907 911 919 929 937 941

947 953 967 971 977 983 991 997

From the chart, you will see that all even numbers (except for 2) are not prime since they are all divisible by 2 and another number besides 1.

Prime numbers comprise an infinite list of numbers.

2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89
97 101 103 107 109 113 127 131 137 139 149 151 157 163 167 173 179
181 191 193 197 199 211 223 227 229 233 239 241 251 257 263 269 271
277 281 283 293 307 311 313 317 331 337 347 349 353 359 367 373 379
383 389 397 401 409 419 421 431 433 439 443 449 457 461 463 467 479
487 491 499 503 509 521 523 541 547 557 563 569 571 577 587 593 599
601 607 613 617 619 631 641 643 647 653 659 661 673 677 683 691 701
709 719 727 733 739 743 751 757 761 769 773 787 797 809 811 821 823
827 829 839 853 857 859 863 877 881 883 887 907 911 919 929 937 941
947 953 967 971 977 983 991 997