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What is a perfect square?
Perfect Square:
A natural number $a$ is called a perfect square, if there exists a natural number $b$ such that $a = b^2$.
For example,
$36 = 6 \times 6 = 6^2$. So, 36 is a perfect square.
$169 = 13 \times 13 = 13^2$. So, 169 is a perfect square.
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