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.
21 22 23 24 which is the prime number
It is 23
23 is prime.
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.
21
23 is a prime number.
Only 23 is a prime number.
21 22 23 24 which is the prime number
23
3, 13, 17, 23 are prime numbers. The others are not.
It is 23
23 is prime.
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.
The greatest prime number below 25 is 23.
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.
None of them is a prime number.
23