Do electrons have the mass as protons?

Protons are part of the nucleus, so they have less mass than the nucleus (except in the specific case of hydrogen, where the nucleus is a single proton so they have the same mass).

Electrons are much less massive than protons. It would take 1836 electrons to equal the mass of one proton.

Neutrons are very slightly more massive than protons, by just about the mass of an electron. They're close enough that they're generally treated as having essentially the same mass.