Prime numbers are considered a fundamental building block of numbers, especially number theory, a branch of mathematics. The first 10 prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23 and 29.

A prime number has exactly two factors, itself and one. The first ten prime numbers are \({2}\), \({3}\), \({5}\), \({7}\), \({11}\), \({13}\), \({17}\), \({19 ...

A factor is a number that goes into another. The factors of 10 for example are 1, 2, 5 and 10. Prime numbers are a special set of numbers that only have two factors: themselves and 1. An example ...