6, 8, 10, 14 and 15.
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The composite numbers less than 16 that have exactly 4 factors are 6, 9, and 14. Their factors are as follows:
6: 1, 2, 3, 6 9: 1, 3, 9 14: 1, 2, 7, 14
The one with less than three factors.
Prime numbers have two factors. Composite have more than two. Neither (one and zero) have less than two.
Any number that has factors smaller than itself (other than 1) is a composite number.Any number that has factors smaller than itself (other than 1) is a composite number.Any number that has factors smaller than itself (other than 1) is a composite number.Any number that has factors smaller than itself (other than 1) is a composite number.
If a number has more than two factors, it's composite.
The greatest composite number that is less than 100 is 99. Its factors are 1, 3, 9, 11, 33, and 99. It can't be prime because it has factors other than 1 and itself.