√9 = 3. The square root of 9 is 3, because 3 × 3 = 9. 9 is a perfect square.
√9 at a glance.
Value
3
Rounded
3
Perfect square?
Yes
9 squared
81
Checking it in your head
A perfect square's root is a whole number, so check by multiplying back: 3 × 3 = 9. Its last digit fits too: squares only ever end in 0, 1, 4, 5, 6 or 9, and 3² ends in 9.
Frequently asked questions
What is the square root of 9?
The square root of 9 is 3, because 3 × 3 = 9. 9 is a perfect square.