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[[File:Eratosthenes.jpg|thumb|Eratosthenes.]]
A '''prime number''' is a [[natural number]] greater than 1 that is [[divisible]] by only 1 and itself. Equivalently, the number has exactly two [[factor]]s, 1 and itself. The first few prime numbers are 2, 3, 5, 7, 11, 13...
A '''prime number''' is a [[natural number]] greater than 1 that is [[divisible]] by only 1 and itself. Equivalently, the number has exactly two [[factor]]s, 1 and itself. The first few prime numbers are 2, 3, 5, 7, 11, 13...