Maine is about 4.5 times smaller than Germany.

Germany is approximately 357,022 sq km, while Maine is approximately 79,931 sq km, making Maine 22.39% the size of Germany. Meanwhile, the population of Germany is ~84.3 million people (83.0 million fewer people live in Maine).
Tip: This to-scale comparison of Germany vs. Maine uses the Mercator projection, which distorts the size of regions near the poles.