Math is not "truth". Math is a tool for examining and labeling. You cannot take math, in and of itself, and prove itself, on the nature of itself. Numbers are not real, they're a system of comparison.
Lots of numbers are real: http://en.wikipedia.org/wiki/Real_number
And seriously, from the information we know now, there are pretty decent odds that your assertion is false.
http://www.sciencedaily.com/releases/2013/07/130715070138.htm
If you study the philosophy of mathematics, you could even convince yourself that mathematical truths would exist independently of humans or even the entire universe.