2. By definition 25 is the number you would multiply times itself to get 25 for an answer. In other words, what times what would give you a product of 25? Because we are familiar with multiplication, we know that 25 = 5, because 5 x 5 = 25. 5 is the square root of 25. Numbers like 25 and 49, which have whole numbers for their square roots, are called perfect squares. You need to memorize at least the first 15 perfect squares. By definition 49 is the number you would multiply times itself to get 49 for an answer. In other words, what times what would give you a product of 49? Because we are familiar with multiplication, we know that 49 = 7, because 7 x 7 = 49 . 7 is the square root of 49.
