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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.

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Q: Is 19 21 or 23 composite or prime?

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21 is composite. 19 and 23 are prime.

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

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

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

21 is composite.

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

19 and 23 are prime.

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

1 and 19; 19 is prime. 1, 3, 7 and 21; 3 and 7 are prime. 1 and 23; 23 is prime.

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

23 is prime. 21 is composite as it is 7x3. A prime number has only 2 factors which are 1 and itself. Composite numbers are every other positive integer except 1 and 0. 1 and 0 are neither prime, nor composite.

They are all prime numbers except for 15 21 25 and 27 which are composite numbers

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It is a composite.

prime number: divisible by itself and 1. composite number: divisible by more than itself and 1. Prime: 2 3 7 17 23 composite: 6 9 18 21

It would be impossible to list them all, since numbers go on forever, but here are some of them: 2 - Prime 3 - Prime 4 - Composite 5 - Prime 6 - Composite 7 - Prime 8 - Composite 9 - Composite 10 - Composite 11 - Prime 12 - Composite 13 - Prime 14 - Composite 15 - Composite 16 - Composite 17 - Prime 18 - Composite 19 - Prime 20 - Composite 21 - Composite 22 - Composite 23 - Prime 24 - Composite 25 - Composite 26 - Composite 27 - Composite 28 - Composite 29 - Prime 30 - Composite 31 - Prime 32 - Composite 33 - Composite 34 - Composite 35 - Composite 36 - Composite 37 - Prime 38 - Composite 39 - Composite 40 - Composite 41 - Prime 42 - Composite 43 - Prime 44 - Composite 45 - Composite 46 - Composite 47 - Prime 48 - Composite 49 - Composite 50 - Composite

Prime: 2 3 5 7 11 13 17 19 23 29 Composite: the others

23 is a prime number.

27 is composite. 27 = 3 * 3 * 3 = 3315 is composite. 15 = 3 * 521 is composite. 21 = 3 * 723 is a prime number. It is only evenly divisible by itself and one.

23 Prime numbers are odd numbers and 21=3x7

23 is prime.

It is a prime number

The number 23 is a prime number. It has only 1 and 23 as its factors.

A twin prime is a prime number that differs from another prime number by two.ex. (5, 7)The numbers two away from 23 are 21 and 25 which are both composite numbers.So in short, no 23 is not a twin prime.

40 is composite. Its prime factorization is 23 * 5.