If the number of ex or sexual intercourses is the one of the first questions you ask when you are in the "prospective" state, yes that is creepy. And a huge warning sign that you are probably a toxic person.
I don't care about ex partners. I'd rather know if my sexuality is compatible with that person and if that person is comfortable/confident with their sexual life.
You added "one of the first questions" to make your position seem less insane, Lmao.
Nobody's first question is "have you ever been a porn star" but it's going to come up eventually and, whether or not you care it will definitely be a deal breaker for many.
Your comment above was mentionning "prospective partner", so it implies happening during the early stages of a relationship.
Or I don't know, maybe in your culture you have to wait months / years before considering a partner someone you are dating regularly / spending a significant part of your life with.
Knowing somebody before being in a relationship with them is anything but unusual. Even if you start dating somebody you never knew before you still get to know each other before making any sort of commitment. Keep coping though.