Comment by srean

To answer your question you need to define what a number is to you. There are many different kinds of numbers, naturals, integers, rationals, irrationals, computable reals, reals, infinitesimals... Not even getting into complex, quaternions, octonions etc.

Is sqrt(2) a number to you ?

If you accept computable reals as numbers then \pi is definitely a number. So is the golden ratio.