The square root of 64 is:

$\sqrt{64} = 8$

Do you want more details or have any questions?

Here are 5 related questions:

1. What is the square root of 81?
2. Simplify $\sqrt{36}$.
3. How would you simplify $\sqrt{144}$?
4. What is $\sqrt{49}$?
5. How do you solve $\sqrt{100}$?

Tip: The square root of a number is a value that, when multiplied by itself, gives the original number.