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Q: What number is a factor of 70 is a prime number and 21 is a multiple?

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

21 is composite number that is a multiple of 3. 31 is a prime number.

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.

3 is a prime factor of 12 and of 21.

No, it is not possible. Every multiple of 21 is a composite number. 21 is a composite number and its factors are 1, 3, 7 and 21(4 factors). Any multiple of 21 must have all the factors of 21. So, every multiple of 21 has at least 4 factors. And a prime number has only two factors so, any multiple of 21 can't be prime.

3

3 and 7

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

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

3 and 7

They are: 3 and 7

Any multiple of 105.

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

3

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

21 and 6 are two composite numbers that have 42 as a common multiple. One of the prime factors of 42, which is 3, is a prime factor of 21 and 6 as well. The prime factorization of 42 (2 x 3 x 7) includes the prime factorization of 21 (3 x 7) and 6 (2 x 3).

3 x 7 = 21

21 has 3 as a factor and is a multiple of 7, and so as 210, 105, and an infinite number of other numbers.

Like 21? Prime numbers.

The factors of 21 are 1, 3, 7, 21. The factors which are not a multiple of 7 are 1 and 3.

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.

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

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

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.

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