Yes.
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The only composite factor of 21 is 21.
21 is composite number because it has more than one number that goes into it
number 21 is prime
Who says it is? 21 is a composite number!
21 is a Composite Number. A prime number is a whole number that only has two factors which are itself and one. A composite number has factors in addition to one and itself. 21 is divisible by 3 and 7.