Imagine you're playing with a bunch of blocks. You have to choose a certain number of blocks and check if that number is a Wilson prime.
A Wilson prime is a special number that can only be found when you multiply all the numbers from 1 to one less than the special number, then add 1. If the result can be divided exactly by the special number, then the special number is a Wilson prime.
For example, let's say you choose the number 5. You have to multiply all the numbers from 1 to 4: 1 x 2 x 3 x 4 = 24. Then you add 1: 24 + 1 = 25. If 25 can be divided exactly by 5, then 5 is a Wilson prime.
Wilson primes are pretty rare, and the first few are: 5, 13, 563, 3,203,431. People love finding Wilson primes because they're interesting and special!