Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
prominently [ˈprɔmɪnəntlɪ] adv заме́тно
he figured prominently in the case он игра́л заме́тную роль в э́том де́ле
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.