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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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Q: Is 21 a factor of a prime number?

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3 is a prime factor of 12 and of 21.

If 21 is a multiple of the number, the number cannot have 90 as a factor.

21 is not a prime factor, it is 3 x 7

3

3 and 7

3 and 7

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They are: 3 and 7

21 = 3 x 7 both 3 and 7 are prime numbers

a factor is a factor , a prime number is a prime number, but a prime factor is a factor which is a prime number. it has to depend on what number number. exp 13 is a prime number

prime factor = prime number which can be divided into the given number with no remainder The prime factors of 21 are 3 and 7.

If 1 is considered a factor, the only common factor of 21 & 19 is 1, because 19 is a prime number. I'm not sure whether 1 is considered a factor since it does not reduce the original number and it's not a prime number.

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3 x 7 = 21

Yes, 4 and 21 are relatively prime. Numbers that are relatively prime only have the number 1 as a common factor. That is the case with 4 and 21.

3x7=21 3 and 7 are prime numbers, so 3x7 is the factor tree of the number 21.

the greatest common factor of 8 21 and 75 is 1.

Like 21? Prime numbers.

It is when the prime factors of whole number are multiplied together that they equal that number. For example the prime factors of 21 are 3 and 7 so 3*7 = 21

21 = 3 x 7. Both these factors are prime.

no because 21 can be divided by 3, 7, and itself now 22 is not a prime factor either because it can be divided by 2 and 11 and of course itself, And prime factor is a number that can only divided by 1 and itself

13 is a prime number. The only prime factor of a prime number is the number itself.

21 is a composite number because it has at least one positive factor other than one or itself.

38 2-19= 21

A composite factor is a factor that is a composite number, as opposed to a prime factor which is a factor that is a prime number.