The number 208 is considered an imperfect square because the square root of the number ends in a decimal point. A perfect square is the square of a whole number. For instance, the square root of 16 is 4 and 4 x 4 = 16. Sixteen is considered a perfect square because it is a whole number.
The universal symbol for the square root is called a radical. This symbol looks like a check mark with a line across the top going to the right.Learn more about Algebra