Square Roots

Square roots are when there is numbers like 2 times 2 or 15 times 15 and so on. The one that I don't like about square roots my teacher gives us big numbers like 400. The answer to that would be 20. the ones that don't have a square root are the ones that are between two square roots. For example is maybe what two square roots is 15 between and the answer would be 12 and 14. That isn't so hard is it? Lets see if there is something that is more of a challenge. The number 19 would be between two square roots 16 which has the square root 8 and also between 25. this are some of the example of things that I did as homework about exponents.