Question

Is 50 a perfect square ? Explain your answer please 

Answer 1

No it is not. A perfect square is a number that, if you take the square root of, gives you a whole number.
A perfect square would be :  1, 4, 9, 16, 25, 36, 49 etc.

Answer 2

No, 50 is not a perfect square.  A perfect square is any number that can be divided by any number to get the quotient as the same number AND the quotient must be rational.  When you divide 50 so that the quotient equals the divisor, you will get an irrational number.  Therefore, 50 is not a perfect square.