23 is a prime number.

21 22 23 24 which is the prime number

It is 23

23

21 = 3 x 7, so it is not a prime number. 23 = 1 x 23, it does not have any other factors, so it is a prime number. 25 = 5 x 5, so it is not a prime number.

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

3, 13, 17, 23 are prime numbers. The others are not.

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

The number 21 would be the answer. 19 and 23 only have two factors, 1 and themselves, as they are prime numbers. 25 only has 1, 25 and 5. 21 has 1, 21, 3 and 7 for 4 possible 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.

prime of numbers 21 22 23 24 25 26 27 28 29 30 prime numbers are: 23 & 29 because their factors are only 1 and themselves. factors of: 23= 1, 23 29= 1, 29 22, 24, 25, 26, 27, 28 & 30 are not prime numbers because these numbers have other factors aside from 1 and themselves. Example: factors of 22: 1, 2, 11, 22

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

23 is prime.

19: 1, 19 21: 1, 3, 7, 21 23: 1, 23 25: 1, 5, 25

1, 3, 7 and 21; 3 and 7 are prime. 1, 5 and 25; 5 is prime.

The composite numbers between 20 and 25 are 21, 22, and 24. 23 is the only prime number between 20 and 25.

31 and 23 are prime numbers.

None of them is a prime number.

The prime numbers between 15 and 25 are- 17, 19 and 23.They are: 17, 19 and 23They are: 17 19 and 23

The greatest prime number below 25 is 23.

21 = 3x7 23 = prime 25 = 5x5 27 = 3x9 29 = prime 31 = prime 33 = 3x11 35 = 5x7 37 = prime 39 = 3x13

23

If you mean: 23 25 and 29 then 23 and 29 are prime numbers while 25 is composite.

9, 15, 21, 25 and 27 aren't .. because they have more than two divisors.

Only since 23 is prime.

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