Comment Re:It's every *even* number (Score 1) 170
The number 1 is not prime. If it were, the Fundamental Theorem of Arithmetic (every integer can be written as a unique ordered product of primes) would be false because you could represent, say, 4 as 2x2, 1x2x2, 1x1x2x2, 1x1x1x2x2, etc.