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.
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It is 69.
2 is the smallest prime number. 9 is the greatest composite number less than 10. The sum of 2 and 9 is 11.
4 is a composite number (2 x 2), and it is less than 5.
It is 10
4 is.