Show that each of the following numbers is a perfect square. Also, find the number whose square is the given number.
$$3969$$
We know that
It can be written as
$$3969=3 \times 3 \times 3 \times 3 $$
Here
After pairing the same prime factors, no factor is left
Therefore, $$3969$$ is a perfect square of $$3 \times 3 \times 7 =63$$