Idaho is about 298 times bigger than Singapore.

Singapore is approximately 719 sq km, while Idaho is approximately 214,314 sq km, making Idaho 29,699% larger than Singapore. Meanwhile, the population of Singapore is ~5.9 million people (4.4 million fewer people live in Idaho).
Tip: This to-scale comparison of Singapore vs. Idaho uses the Mercator projection, which distorts the size of regions near the poles.