Alaska is about 573 times bigger than Luxembourg.

Luxembourg is approximately 2,586 sq km, while Alaska is approximately 1,481,348 sq km, making Alaska 57,183% larger than Luxembourg. Meanwhile, the population of Luxembourg is ~650,364 people (59,867 more people live in Alaska).
Tip: This to-scale comparison of Luxembourg vs. Alaska uses the Mercator projection, which distorts the size of regions near the poles.