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Q: Is 19 21 or 23 composite?

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21 is composite.

No, they are three numbers, not one. 21 is composite.

19 and 23 are prime numbers whereas 21 is a composite 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.

All the numbers are composite except the ones in bold: 18 19 20 21 22 23 24 25.

17, 19, 23, 29 and 31 are prime. 15, 21, 25 and 27 are composite..

15 is composite number 17, 19 and 23 are prime numbers.

19 is prime number. 10, 21 and 62 are composite numbers.

21, 55, 77, and 93 are composite numbers. 23 is a prime.

Out of that list, only 57 is composite.

One is prime, the other two are composite.

19. It is prime.

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