Prime numbers don't have proper factors.
The proper factors of 26 are 2 and 13
13 is a prime number so the only factors are 1 and itself. Prime numbers have no proper factors.
3 and 13
3 and 13
5 and 13
2, 4, 13, 26
91 has 4 factors (2 of them which are proper). Those factors are:{1, 7, 13, 91}
The two proper prime factors are 7 and 13.
No. Some proper factors are prime.
No, no prime number has proper factors.
1 doesn't have proper factors.
One has no proper factors.