It can be. 22 is a proper factor of 44.
It depends on the number being factored. 22 is a proper factor of 44. 22 is a factor, but not a proper factor, of 22.
It can be. 11 is a proper factor of 22, among others.
The only proper factor of four is two.
3 is the only proper factor of 9.
Yes. 17 is a proper factor of 34.
No, a prime factor is a single factor that is a prime number. A proper factor is a member of the set of factors that doesn't include one and the number itself.
No.
NO
Without referring to a particular number, the next factor after 22 is 23.
Depending on your definition of proper factors, the set of proper factor factors either doesn't include 1 and/or the number itself for a given number.
No, prime numbers do not have proper factors.
The only proper factor of four is two.