So yeah, I finally googled it.
It’s weird that I know these concepts but never actually internalized them (that is to say, I recognize them from school but only because I had to memorize/familiarize them for tests, I didn’t even attempt to understand, damn my laziness).
The only answer I could find was: depends on what you mean by “exist”.
If someone asks me if I think numbers exist I’m just going to say: I’m heart says yes but my head says no. lol