Select all prime numbers from the list: 15, 17, 21, 23.
Note
A prime number has exactly two distinct positive divisors. 17 and 23 are prime; 15 and 21 have additional divisors, so they are composite.
Select all prime numbers from the list: 15, 17, 21, 23.
A prime number has exactly two distinct positive divisors. 17 and 23 are prime; 15 and 21 have additional divisors, so they are composite.