| − | A '''prime number''' is a [[natural number]] greater than 1 that is [[divisible]] by only 1 and itself. Described another way, a prime number has only two [[factor]]s, 1 and itself. The first few prime numbers are 2, 3, 5, 7, 11, 13 .... The opposite of a prime number is a [[highly composite number]]. | + | A '''prime number''' is a [[natural number]] greater than 1 that is [[divisible]] by only 1 and itself. Described another way, a prime number has only two [[factor]]s, 1 and itself. The first few prime numbers are 2, 3, 5, 7, 11, 13 .... The opposite of a prime number is a highly [[composite number]]. |
| | ''Mathematicians have tried in vain to this day to discover some order in the sequence of prime numbers, and we have reason to believe that it is a mystery into which the mind will never penetrate.'' | | ''Mathematicians have tried in vain to this day to discover some order in the sequence of prime numbers, and we have reason to believe that it is a mystery into which the mind will never penetrate.'' |