1, 2, 4, 8, 16, 32, 64
All but 1 and 2 are composite.
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A composite number has three or more factors.
17 has no composite factors.
The composite factors of 63 are 9, 21 and 63.
Yes, 2 is a factor of 64. The reason behind this is that 64 is divisible by 2. Numbers which go into 64 are its factors and 2 is one of the factors.
1,2,3,6,7,14,21,42 6,14,21 and 42 are composite.