1 and 2 are factors of all even numbers.
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No. Perfect square numbers have an odd number of factors.
The factors of all numbers can be written in pairs. With square numbers, one of those pairs is the same number twice. When listed singly, square numbers have an odd number of factors. All others are even.
All of the factors of 12 are 1,2,3,4,6,12. Therefore, the even factors must be 2,4,6,12.
In mathematics, all nonzero numbers have factors. Some factors are even numbers, some are odd. An even factor is a factor that is an even number.
All even numbers greater than 2 have even proper factors, since they all have 2 as a proper factor.