Prime numbers have been investigated for more than 2,000 years, since at least the era of the ancient Greek mathematician Euclid. There are infinitely many, but what is the largest known prime number?
Prime numbers are those that can be evenly divided only by 1 and themselves, such as 3 and 7. They are key building blocks in math; per the fundamental theorem of arithmetic, every number greater than 1 is either a prime number or a multiple of a prime number, according to the University of Houston.
