624 is composite. All positive, whole numbers greater than five and ending in 0, 2, 4, 5, 6 or 8 are 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