21
21 is not a prime.
31 and 41 are prime numbers because they have only two factors
31, 37 and 41 are all prime numbers
The numbers 31, 37 and 41 are prime (including the boundaries).
21.
The numbers 23, 29, 31, 37, 41, 43 and 47 are prime.
Yes.
There is an infinite number of prime numbers that are greater than 21. The next prime number after 21 is 23.
31 and 61 are prime numbers. The prime numbers between 31 and 61 are 37, 41, 43, 47, 53, and 59.
Only 1 between 31 - 41.It is 37.
31, 37, & 41 are prime; 32,33,34,35,36,38,39 & 40 are composite.
There are five prime numbers: 31, 37, 41, 43, and 47.