Regarding infinity and primes:

http://www.scientificamerican.com/article.cfm?id=first-proof-that-infinite-many-prime-numbers-come-in-pairs&WT.mc_id=SA_WR_20130522

Math as English Describes our World as We See or Don't See It

Mathematics, a series of numbers and symbols and relationships can define our world as we each see it.

But two plus two doesn't always equal four.

Definitions in English or native language determine what is counted and the boundaries of those definitions.