Because 2 can divide evenly into 44 with no remainder. Every even number has two as a factor.
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44 2 22 2 11
It is: 2*2*11 = 44
..........44 ........../ \ ........11 4 ............/ \ ............2 2
Try to divide - in this case, 44 / 2. If you get a whole number, it's a factor; otherwise it isn't.
44 is a composite number; it has factors other than 1 and itself. It is not a prime number. The 6 factors of 44 are 1, 2, 4, 11, 22, and 44. Of these, 2 and 11 are prime.