Is the square root of 64 a rational number

The square root of 64(which is 8)is a rational number as it can be written as a fraction.

The square root of 64 is 16, which yes, is a rational number. You get the square root of 64, (or really, any number!) by dividing it by 4. your answer, which in this case, was 16, is a rational number because:
*it can be written as a ratio, like; 1:16
*it can be written as a fraction; 16/1 (be careful not to say it's reciprical, 1/16!!!)
*and finally, you can write this ration in word format, which will always be said as, 1 to 16, so you basically write "to" instead of (:)