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Q: Which one is a prime number 19 21 or 23?

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They are 13 and 19 which are prime numbers

21 is a composite number, not a prime, having prime factors 3x7.

19. It is prime.

31 is a prime number.

The prime numbers between 10 and 21 are 11, 13, 17, and 19.

Related questions

19 is prime.

19

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.

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

They are 13 and 19 which are prime numbers

The number 1 is neither prime nor composite. The numbers 25, 16, 21, and 27 are divisible by factors that are not one or the number itself. 19 is the only one that has only 1 and itself as factors, so it is a prime number.

19

21 isn't because 7*3=21.

21 is a Composite Number. A prime number is a whole number that only has two factors which are itself and one. A composite number has factors in addition to one and itself. 21 is divisible by 3 and 7.

23 Prime numbers are odd numbers and 21=3x7

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

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