No: I don’t think your past and how many relations you have had makes a difference apart from if you have a concern about sexual health, but STD’s can happen if you only had one partner. I have been in a relationship for 21 years (a bad one at the moment but still…) and I don’t know how many sexual partners he had before me. I wouldn’t care.
If someone asked me I would tell them, but they don’t, in my opinion have a right to ask.
I imagine people who ask about numbers, are the ones who have issues and insecurities and therefore shouldn’t ask because it will only feed that. Not a relationship expert by any means but I think the past is the past and it shouldn’t matter. I would be more interested in if the person demonstrated they could be faithful while in a relationship with how many partners they had.