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Mathematics describes perfectly that happend in the past 13,8 billion years, and also everything that will happen in the next 137 quintillion years.

I can´t see why would anybody question if it is real.

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We don't actually know that. Science (especially physics) assumes that the universe can in principle be explained, but there's not actually a way to prove this without assuming some explainable is possible (see: problem of induction). More concretely, we know our current theories and maths can't fully explain our observations, though they are very close.

A better title is, does math exist outside of our minds.

I doubt the universe cares about numbers.

Indeed, this should be the title. Not clickbait enough, tho.

At that point, a more salient question would be whether anything at all exists outside our minds.

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