1, 3, 5 are all prime factors of 15
3 and 5 only. 1 is a special number that has no factors but itself yet it is not counted as a Prime number.
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15 is a factor of 45, but it is not a prime number.
No, 1 is not a prime number.
That's a prime factor.
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.