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If you mean what do you call a number with only 1 and itself as factors, then it is a prime number.
13 is a prime number. The only prime factor of a prime number is the number itself.
A prime number has only one prime factor, and that prime factor is the number itself.
Because a prime number has two factors whereas 1 has only one factor which is itself
The only prime factor of 16 is 2.