Yay!
Yes that is easy. With a prologue, you can make a special Section Layout for chapters that aren’t numbered chapters. It would basically be the same as the other one, but you would leave the numbering token out of the title prefix settings, and maybe just type in el prólogo instead, if that’s all the layout is meant to do. If you would like to use the layout for other things, then I would turn on the Title checkbox for the layout, and put the title that is supposed to print into the binder name.
So for that you need:
- A Document Type for these types of things, in Project Settings.
- Set the first section to that type in the inspector.
- In the Format, duplicate the chapter layout and modify the title options as you need.
I’m not Spanish, but I do live here. 
Although living in Galicia, I’m picking up more Galego Portuguese than Spanish!