ok well i am in prime and composite in math class and this is how:
If the number is a prime then it can only have 2 factors. If it has 3 or more it is a composite number.
Say 25 has a lot of factors so it is a composite number. And if 1 has only 1 factor then it is a Prime number. And there you have prime and composite.
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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.
Composite