3 x 7 = 21
2 x 11 = 22
because
3 x 7 = 21
2 x 11 = 22
23 is prime.
The prime number is 24
21 = 3x7 ... not prime. 22 = 2x11 ... not prime. 23 is prime. 23.
Factors of 21: 1, 3, 7 and 21 Factors of 22: 1, 2, 11 and 22 Factors of 23: 1 and 23 Note that: 2, 3, 7, 11 and 23 are prime numbers
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
23
You can work this out, Prime numbers can only be divided by themselves or 1. Therefore as 20 can be divided by 2 it it not prime. The same is true for 22 and 24. Thus the prime must be either 21 or 23. See if either of these numbers can be divided by 7, if it can then the prime must be the other number.
They are 6, 10, 14, 15, 21, 22.They are 6, 10, 14, 15, 21, 22.They are 6, 10, 14, 15, 21, 22.They are 6, 10, 14, 15, 21, 22.
21 = 3 * 760 = 2 * 2 * 3 * 5 = 22 * 3 * 5
I am not sure there is such a classification. It cannot be odd/even Odd numbers: 52 - 22 = 21 Even numbers: 52 - 32 = 16 It cannot be prime/composite Prime: 32 - 22 = 5 Composite: 52 - 22 = 21
23 is prime. And, for your information, a nun is a Christian woman who dedicates her life to her religion and has nothing whatsoever to do with prime numbers.
All the numbers are composite except the ones in bold: 18 19 20 21 22 23 24 25.