What's wrong with me, why am I getting so annoyed that the other comments are acting like there's actually a chance it's right? Are they just being funny, or do they actually think the question "what's the last digit of pi" makes sense? Even if they're wrong, why should I care?!
It's common knowledge, yes, but most people don't care about differentiating between a humongously large number we are not capable of calculating vs an infinite number that can never be calculated even if we have a machine powerful enough to do it, because it's not relevant to pretty much any day to day life.
Nah, pi arises purely from math, it doesn't depend on the universe. The number we call pi would still be an irrational number even if the universe is a simulation that uses a rational approximation of pi.