This is something to do with math...
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It is when you simplify a number to where it can't be divided anymore without being even. example: 2*3=6
some prime factors are 2,3,5,7,11,13,17
2 is the only even prime factor
1 isn't a prime number
some prime factors are 2,3,5,7,11,13,17
2 is the only even prime factor
1 isn't a prime number