√64 = 8. The square root of 64 is 8, because 8 × 8 = 64. 64 is a perfect square.
√64 at a glance.
Value
8
Rounded
8
Perfect square?
Yes
64 squared
4,096
Checking it in your head
A perfect square's root is a whole number, so check by multiplying back: 8 × 8 = 64. Its last digit fits too: squares only ever end in 0, 1, 4, 5, 6 or 9, and 8² ends in 4.
Frequently asked questions
What is the square root of 64?
The square root of 64 is 8, because 8 × 8 = 64. 64 is a perfect square.