Which of these is prime 4 or 10 or 3?

Answer 1

A Prime number can only be divided by itself or 1. Thus all the prime numbers between 1 and 100 are:- 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89 and 97.

Answer 2

3 is the prime number, because it has only itself and the number 1 as divisors. 4 and 10 have other divisors, such as 2, and are hence not prime.