A prime number is a number that can only be divided by itself and 1 without remainders.
The prime numbers from 1 to 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, 97.
1 is not a prime number because it has only one factor, namely 1. Prime numbers need to have exactly two factors.
2 is a prime number because its only factors are 1 and itself.
51 is not a prime number because it has 3 and 17 as divisors, as well as itself and 1. In other words, 51 has four factors.
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