2, 4, 8, 16, 32
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I think so. If it has any other factors besides ' 1 ' and 32, then it's composite. Let's see if we can find any others. The factors of 32 are: 1, 2, 4, 8, 16, and 32. Yes, there are other factors besides ' 1 ' and 32, so it's composite.
factors of 64: 1, 2, 4, 8, 16, 32, 64 composite factors of 64: 4, 8, 16 32, 64
It has more than two factors.
A prime number is a number that has only 2 factors. That is, it can only divide by 1 and itself. 32 is even, and has the factors 1, 2, 4, 8, 16 and 32. Thus it is not a prime, but is a composite number.
21 and 32