There's more, you just don't know it all. It goes on forever. Even scientists haven't figured it all out because it goes on forever. That's only a small portion of the whole thing. I bet you don't even know what Pi is.
Definition of Pi - Pi is how many times the diameter of a circle will go into itself. Pi has no particular pattern, and (as believed) goes on forever. The diameter of a circle is about 1/3 of the circle, thus the 3.1.