It is a square number because 7*7 = 49
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If by 'perfect number' you mean 'perfect SQUARE', then yes. 49 is an odd number and a perfect square.
There is no limit to the number of perfect squares. To find a perfect square, you simply need to pick a number and square it. E.g. 7^2=49, so 49 is a perfect square. As there is infinitely many numbers to pick, and as the larger a number the larger it's square, there are infinitely many perfect squares and they just keep on getting larger!
No - 48 is not the square of an integer, though 49 is.
it is a rational number. since it is a perfect square and a non recurring decimal
16, 25, 36, 49, 64, or 81