What is the square root of 9?

The square root of 9 is a number that, when multiplied by itself, equals 9.

• The principal square root of 9 is 3, because 3 * 3 = 9. Here's more about principal square root.

• Technically, 9 has two square roots: 3 and -3, since (-3) * (-3) = 9. Learn more about negative numbers.

• The square root of 9 is a rational number, because it can be expressed as the ratio of two integers (3/1). It's also an integer itself.

• The symbol for square root is √. Therefore, √9 = 3. You can also express it as 9^1/2 = 3. More on exponent can be found here.