Select all prime numbers from the list: 21, 29, 31, 49
Note
29 and 31 are primes because they have no divisors other than 1 and themselves; 21 and 49 are composite (21=3·7, 49=7·7).
Select all prime numbers from the list: 21, 29, 31, 49
29 and 31 are primes because they have no divisors other than 1 and themselves; 21 and 49 are composite (21=3·7, 49=7·7).