factors of 21: 3, 7 prime factors of 21: 3, 7
The prime factors of 21 are 3 x 7.
It is: 3*7 = 21
21 = 3 x 7 both 3 and 7 are prime numbers
17 is a prime number, but 21 is not (21 = 3 * 7).
They are: 3 and 7
3 x 7 = 21
3 and 7 are prime numbers whose product is 21.
It is 3 time 7 = 21
Its factors are: 1 3 7 and 21 Note that 3 and 7 are prime numbers
3 and 7
There are two different numbers. 3 and 7