Is your number a prime number?
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Prime Number
A prime number is a natural number greater than one that has exactly two natural divisors: 1 and itself. Number theory is the study of the properties of prime numbers.
This is the sequence of prime numbers starting from 2:
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, 101, 103, 107, 109, 113, ...