Those number represent links to the available pages. If you Google search would have 3 pages of results, you'd 123. They are clickable and clicking on number 2 would bring you to the second page of your search results.
Hmmm, had to think about this for a moment, but I think they are just called "page-links". At least that's what they are called on WordPress, and I can't imagine that WordPress uses some esoteric term for them.
Hey thanks for replaying!
That wasn't quite helpful because google images is not showing me anything when i type page-links, i want some stylish page-links for insparation so...
well, at least now i can call them by a name rather than things, thanks!