All even numbers have at least one even prime factor.
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All nonzero numbers have factors. Some factors are even numbers, some factors are odd numbers.
Odd. I determined my answer by looking at the number of factors of a square number.
Two is a prime number (and the only even prime number). Its only factors are 1 and itself.
An odd number.
2, 4, 6, 10, 12, 20, 30, 60 add up to 144.