All you people don't have to be rude maybe its not a joke! Maybe he doesn't know so stop saying are you serious? we all don't get things and he might not get math that doesn't mean you have to yell at him for it we aren't perfect!!! and the answer is 2! (:
Ok, I know I'm really late on answering this one. I don't care.
Squaring something is multiplying a number by itself (it's a kind of exponent. Squaring is another way of saying "to the second power", cubing is another way of saying "to the third power and after that you just say to the ___ power, straight out. What it means is that number times itself, the amount of powers. Like, three to the fifth power would be: 3x3x3x3x3...I'm not sure if you need to know that yet or not) For example, five squared is twenty-five. The square root of a number is what number, squared, will equal the said number. So the square root of twenty-five would be five. Therefore, since two times two equals four, the square root of four would be 2.