ルート さん は いくつ

The term "ルート" (root) in mathematics refers to the square root. Specifically, "ルート3" means the square root of 3, which is approximately 1.732. This is the positive number that, when multiplied by itself, equals 3. Therefore, "ルート3 はいくつ" asks "What is the value of the square root of 3?" The answer is about 1.73.