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{{See also|Best New Conservative Words}}

{{See also|Best New Conservative Words}}

[[File:Eratosthenes.jpg|thumb|[[Eratosthenes]].]]

[[File:Eratosthenes.jpg|thumb|[[Eratosthenes]].]]

A '''prime number''' is a [[natural number]] greater than 1 which 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 ....  

A '''prime number''' is a [[natural number]] greater than 1 which 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 number 2 is the only even prime.

As the building block for all numbers, prime numbers have a [[spiritual]] quality that has fascinated [[mathematicians]] and others.  Prime numbers are a great way to learn and teach [[math]], to improve mental acuity and focus, to fend off [[addiction]], and to understand great works such as the [[Bible]].  The two greatest unsolved mysteries in [[mathematics]] relate to prime numbers: why every even number is the sum of two primes ([[Goldbach's conjecture]]), and apparently there are [[infinity|infinitely]] many [[twin primes]].  It is unknown whether there are infinitely many [[Mersenne prime]]s.

As the building block for all numbers, prime numbers have a [[spiritual]] quality that has fascinated [[mathematicians]] and others.  Prime numbers are a great way to learn and teach [[math]], to improve mental acuity and focus, to fend off [[addiction]], and to understand great works such as the [[Bible]].  The two greatest unsolved mysteries in [[mathematics]] relate to prime numbers: why every even number is the sum of two primes ([[Goldbach's conjecture]]), and apparently there are [[infinity|infinitely]] many [[twin primes]].  It is unknown whether there are infinitely many [[Mersenne prime]]s.