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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
Who says it is? 21 is a composite number!
number 21 is prime
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.