You can tell right away just by looking at it that 177 is divisible by 3. It may also be
divisible by other numbers, but you don't need to know that. As soon as you know of
one other factor besides ' 1 ' and itself, you know a number is composite.
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Yes.
4, composite. 67, prime.
Prime
1 is special 2 prime 3 prime 4 composite 5 prime 6 composite 7 prime 8 composite 9 composite 10 composite 11 prime 12 composite ext.
5 prime, 25 composite.