Details:
Do human beings discover or invent Mathematics?
Crucial philosophical question this. Are the rules of Maths, God's fingerprints on the Universe? As it were.
Thus the number 2 would still exist as a concept without their being 2 of anything. Point in favour: scientists predict the existence of things, using Maths, then go out and look to see if they exist in reality.
Point against: Maths is a tool invented by scientists as a kind of language. Like a language, it replicates the reality around it. If there were no human race, there would be no languages, and Maths is a kind of language.
Your call.