Now four is not a prime number, as well as groups of four and one, we can also divide four into two groups of two. Oh, here we go again, this isn’t going to end well. Five is a prime again ...

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