El Salvador is about 54 times smaller than Colombia.

Colombia is approximately 1,138,910 sq km, while El Salvador is approximately 21,041 sq km, making El Salvador 1.85% the size of Colombia. Meanwhile, the population of Colombia is ~49.1 million people (42.5 million fewer people live in El Salvador).
Tip: This to-scale comparison of Colombia vs. El Salvador uses the Mercator projection, which distorts the size of regions near the poles.