We know that perfect squares are numbers like

2
^{
2
}
= 4

5
^{
2
}
= 25

So, here 4 and 25 are perfect squares

Now,

We can also write

0
^{
2
}
= 0

So, 0 is a perfect square

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Square root of 0 is 0, which is an integer

So, 0 is a perfect square