3 is the only proper factor of 9.
The factors of 9 are 1, 3 and 9. The proper factor of 9 is 3.
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. 22 is a proper factor of 44.
The only proper factor of four is two.
If the sum of the digits of a given number equals nine or a multiple of nine, nine is a factor of that number.
Yes. 17 is a proper factor of 34.
yes any factor of nine can be divided by nine
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
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.