Saint Martin is about 2,646 times smaller than Illinois.

Illinois is approximately 143,961 sq km, while Saint Martin is approximately 54 sq km, making Saint Martin 0.04% the size of Illinois. Meanwhile, the population of Illinois is ~12.8 million people (12.8 million fewer people live in Saint Martin).
Tip: This to-scale comparison of Illinois vs. Saint Martin uses the Mercator projection, which distorts the size of regions near the poles.