Europe dwarfs Niger: about 10,180,000 km² km² against 1,185,111 km² km². At true size Europe is about 8.6× larger — the whole of Niger fits into Europe roughly 8 times.
The old Mercator map treated both about equally (1× vs 1.1× inflation), so at least their relative sizes were preserved — even if both were drawn at the wrong absolute scale.
Niger fits 8× into Europe.