21 is a factor of both 21 and 42.
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If 21 is a factor of a number, then the factors of 21 must also be factors. So 3 and 7
There are only two common factors for 56 and 21. They are 1 and 7.
The factors of 63 are 1, 3, 7, 9, 21, and 63. Pick two.
Composite is the opposite of prime which is a number with only two factors. 1 and itself.Composite has more than two factors so I guess a composite number is your answer.