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.
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
21 = 3 x 7 both 3 and 7 are prime numbers
3 and 7
They are: 3 and 7
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.
3x7=21 3 and 7 are prime numbers, so 3x7 is the factor tree of the number 21.
3 x 7 = 21
Like 21? Prime numbers.
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
what number is not a prime factor
That's a prime factor.
1, 3, 7, 9, 21, 63 3 and 7 are prime.
13 is a prime number. The only prime factor of a prime number is the number itself.