The square of a natural number is called a perfect square.
Following are some important properties of square numbers:-
(i) A square number is never negative.
(ii) A square number never ends in 2, 3, 7 or 8.
(iii) The number of zeros at the end of a perfect square is always even.
(iv) The square of an even number is even.
(v) The square of an odd number is odd.
(vi) For any natural number n. n2 = Sum of first n odd natural numbers.