23 is a Prime number.
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Not all numbers between 20 and 28 are composite numbers. 23 is a prime number.
All of them except 23 and 29 which are prime numbers
If you mean: 23 25 and 29 then 23 and 29 are prime numbers while 25 is composite.
23, 29 and 31 are prime. The rest are composite.
They are both prime numbers.