I have read in a newspaper that Benedict XVI is the first pope emeritus.
Is he really the first pope in history to resign? Or does the title pope emeritus have more specific meaning than just a "pope who has resigned"?
No, he is absolutely not the first to resign. There has been several resignations in Papal history, not all of which are undisputed or voluntary, though admittedly none in recent centuries. Some examples include:
All previous popes who had resigned or abdicated their positions may be justifiably referred to as "pope emeritus", which basically just means "retired pope". In this sense, Benedict XVI is definitely not the first, either.
However, Benedict XVI does seem to be the first to be officially styled "Pope Emeritus".