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Q: Which is a composite number 19 21 23?

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

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

21 is composite. 19 and 23 are prime.

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.

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

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

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the composite number is 23

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