There are probably infinitely many ways.
For example,
2 + 23
3 + 5 + 17
5 + 7 + 13
or
37 - 5 - 7
41 - 3 - 13
and so on.
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7 is a Prime number; its only prime factor is 7.
31 is a prime number. Its only prime factor is 31.
Only one - which is repeated.
The only prime factor of 16 is two.
No, only two.