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separated intro into two paragraphs, and expanded the second to include highly composite numbers
[[File:Eratosthenes.jpg|thumb|[[Eratosthenes]].]]
[[File:Eratosthenes.jpg|thumb|[[Eratosthenes]].]]
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 opposites of a prime number are a [[composite number]] and a [[highly composite number]]. A [[composite number]] is the ''general opposite'' to a prime number, and a [[highly composite number]] is the ''special opposite'' to a prime number.