All you have to do is enter a number! It's really simple. You can press space to toggle the variables on and off. (It will be kinda laggy with them on). If a number takes a while to give you an output, it is most likely prime. FYI: All even numbers (accept 2) will come out composite. Pick an odd number!
All of the code is by @jewelpal (me). If you want to use the code, please credit me. Thank you!