The square root of 64 is:

$\sqrt{64} = 8$

Would you like more details or have any questions?

Here are 5 related questions:

1. What is the square root of 81?
2. How do you simplify $\sqrt{49}$?
3. What is the square root of 36?
4. Can you explain how to find the square root of 169?
5. What is the square of 8?

Tip: Remember, squaring a number is the inverse operation of finding its square root.