Prime numbers are numbers that can only be divided by 1 and itself. No other
numbers can divide prime numbers. Smallest prime number is 2. 1 is not a prime
number since it has only one number divisor which is 1 (itself).
As an example, the prime numbers list until 100 are as follows : 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.