2 is an even factor of 4.
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A factor is two multiples that make an even bigger number. Example factors of 12 are 1,2,3,4,6,12
There are not always an even number of factor pairs of a number - for example, prime numbers have an even number of factors, because they are divisible by themselves and 1, but this is only one pair of factors. However, for any square number, (for example, 3 x 3 = 9, 4 x 4 = 16), at least one of these factor pairs will consist of the same number repeated twice.
even
Because every even number can be halved. For example, half of 50 is 25. You divide 50 by 2 and get 25. 100 is another good example. If you divide 100 by 2, then you get 50.
60 is an even number and also a factor of itself