There are two: 25 and 36.
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perfect square numbers are 16 and 25
There is no perfect square number between 1 and 4. On the other hand, every number is a square - or its square roots.
Find the perfect squares that your number lies between. Your square root will lie between their square roots. Whichever it is closer to will indicate the size of the decimal.
If by 'perfect number' you mean 'perfect SQUARE', then yes. 49 is an odd number and a perfect square.
36