No. The only factors of a Prime number are 1 and itself. The only way that 21 could be a factor of a prime number is if it were a prime number, but it is not because 21 is also divisible by 3 and 7.
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If 21 is a multiple of the number, the number cannot have 90 as a factor.
3 and 7
3 and 7
1, 3, 7, 9, 21, 63 3 and 7 are prime.
no