It is a Prime number
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23 is prime.
23 is a prime number.
23 is prime.
There is none because 23 is a prime number
19 is a prime number. Its only factors are 1 and 19. 21 is a composite number. Its factors are 1, 3, 7, and 21. 23 is a prime number. Its only factors are 1 and 23.