19 is prime.
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19 is prime the only numebr that is neither prime or composite is 1
19 is a prime number.
231517 is composite number. 19 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.
247 is not prime. 247 = 13 * 19