Answer:

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97 = 25

Explanation:

A prime number is a number that is greater than 1 and had only 2 factors (factors are a number on which is multiplied with another number produces a given number or expression), therefore, themselves and 1.