3. When a number is multiplied by
itself then the number is the
square number.
2x2=4=2²

4. A square number if it is the
square of some natural number
is called Perfect square.
225 is a perfect of 15.

5. If a number is divided by its
own square, it gives value of
root.
√4 = 2 , √9 = 3 , √144 = 12

6. Three natural number B, P and
H are such that,
B2 + P2 = H2 . Such triplets (B, P
and H) are called Pythagorean
Triplet.

8. The number of zeros in the
end of a perfect square number
is never odd. It is always even.
1000 is not a perfect square.