Here,

- We do prime factorization of the number
- If the prime factorization forms pairs, then it is a perfect square
- If it doesn’t, then it isn't a perfect square

Let’s take some examples

####
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Is 32 a perfect square?
**

**
**

Here, we do not get perfect square as one 2 is left alone.

So, 32 is
**
not a perfect square
**

####
**
Is 120 a perfect square?
**

**
**

Here, 2, 3, 5 are not in pairs

So, 120 is
**
not a perfect square
**