The composite factors of 28 are 4, 14, 28
The composite factors of 24 are 4, 6, 8, 12, 24
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28 is a composite number because it has factors of 2 and 7.
It is a composite number.
composite and 2*2*7 = 28
24 and 51 are composite, 3 is prime.
28 is a composite number because it has more than two factors but 29 is a prime number because it has only two factors.