A prime number is a positive integer (natural number) that has exactly two positive integer factors, 1 and itself. There are 25 prime numbers between 1-100. The first twenty-five prime numbers 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, 97`

The number 1 is by definition not a prime number.

## Prime Numbers Up To 100

What are all the prime numbers from 1-100? The first 25 prime numbers 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, 97