Property 3 Square of even numbers are always even numbers and squares of odd numbers are always odd numbers.

What can you say about the squares of even number and squares of odd numbers.

The sum of an even number and an odd number is an odd number.

The sum of first n odd natural numbers is always an odd number.

Odd and Even Numbers

Property 3 The square root of an even square number is even and that square root of an odd square number is odd.

The sum of consecutive even numbers is always an even number.

Product of two square numbers is always a square number.