ANSWER: 280 is a composite number.
Factors of 280 other 1 and itself: 2, 4, 5, 7, 10, 28, 40, 56, 70, 140
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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