Q: Which is a composite number 19 21 23?

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

21

the composite number is 23

18 (All even numbers except 2 are composite.)

15 has more than exactly two factors (1, 3, 5, and 15), therefore it is composite. 17, 19, and 23 each have exactly 2 factors (1 and the number itself), so they are primes.

Related questions

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

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.

21 is composite. 19 and 23 are prime.

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

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

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..

19 and 23 are prime.

15 is. In addition to ' 1 ' and itself, it has the additional factors 3 and 5 .

21

21

the composite number is 23