There's a lot we don't know about prime numbers

Prime numbers are one of the most basic topics of study in the branch of mathematics called number theory.
Primes are numbers that can only be evenly divided by themselves and 1. For example, 7 is a prime number since I'm left with a remainder or a fractional component if I divide 7 by anything other than itself or 1. 6 is not a prime because I can divide 6 by 2 and get 3.
One of the reasons primes are important in number theory is that they are, in a certain sense, the building blocks of the na