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.
No, prime numbers do not have proper factors.
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.
The only proper factor of four is two.