Answer:
A Perfect Square number from a number system is a number which can be expressed as the square of some number from same number system.
Or A perfect square no is a no. whose square root is possible and belong to same number system.
Number ending with 1 , 2 , 3 , 7 , 8 can never be a perfect square no.
Some examples of Perfect Square No.
16 = (4)² = (-4)²
625 = (25)² = (-25)²
10000 = (100)² = (-100)²

1.21 = (1.1)² = (-1.1)²
Non Perfect Square Number is a number which can not be expressed as the square of some number.
Number ending with 1 , 2 , 3 , 7 , 8 are always a non perfect square no.
Some examples of Non Perfect Square No.
5 , 17 , 12 , 6 , 235 , 1.235 ,
