Answer:
13 is the prime number
Step-by-step explanation:
You must take into account that a prime number is one that is just divisible by 1 and itself. So, let's analyse each number.
Number 14
If you divide 14 by 1 you obtain 14.
If you divide 14 by 14 you obtain 1.
If you divide 14 by 2 you obtain 7.
If you divide 14 by 7 you obtain 2.
14 is not prime because is divisible by 1, 2, 7, and 14
Number 13
If you divide 13 by 1 you obtain 13.
If you divide 13 by 13 you obtain 1.
13 is a prime number because it can't be divided by other number, just 1 and itself
Number 21
If you divide 21 by 1 you obtain 21.
If you divide 21 by 21 you obtain 1.
If you divide 21 by 3 you obtain 7.
If you divide 21 by 7 you obtain 3.
21 is not prime because is divisible by 1, 3, 7, and 21
Number 33
If you divide 33 by 1 you obtain 33.
If you divide 33 by 33 you obtain 1.
If you divide 33 by 3 you obtain 11.
If you divide 33 by 11 you obtain 3.
33 is not prime because is divisible by 1, 3, 11, and 33
Thus, 13 is the prime number
