How do you determine whether the number is a perfect square: 15?
A perfect square is a number that is the result you get from squaring a number. 15 is not a perfect square.
A perfect square is a number that is the result you get from squaring a number. For example, 25 is a perfect square because:
Another way to say this is that the square root of a perfect square is a whole number:
25 meets this test:
So with that known, we can safely say that the number 15 is not a perfect square - it isn't the result of a squaring operation. We can also look at the square root of 15: