some say it is others dont ussially though one is included as a proper factor
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That means that one number is a factor of the other number, but that it's not the number itself. For example: the factors of 9 are 1, 3, and 9. The proper factors of 9 are 1 and 3.
Itself and one
No, 11 is itself a prime so no prime number can be a proper factor of 11.
a prime factor
The positive integer with only one factor is 1.