No
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Because numbers are infinite, there is an infinite number of answers. e.g. What number should be added to 2 to make a perfect square? 2+2=4 (a perfect square) 2+7=9 (a perfect square) 2+14=16 (a perfect square) 2+23=25 (a perfect square) etc... Did you have a specific number in mind.
The square root of 175 is 13.23 (2 decimal places) so it is not a perfect square number. The closest perfect squares are 169 (13 squared) and 196 (14 squared).
If by 'perfect number' you mean 'perfect SQUARE', then yes. 49 is an odd number and a perfect square.
196 is a perfect square because 196 = 14*14.96 is a not perfect square.
You take the square root of the number. If it is a perfect square, this will be a whole number. If it is not, it isn't a perfect square.