Yes. For example, the square root of 1/9.
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Yes.
Yes. Any terminating decimal is a rational number. Any repeating decimal also.
For a number to be a perfect square, the number's square root has to be a whole number. 9 is a perfect square because its square root is a whole number, 3. If the square root of the number is a decimal, then it is not a perfect square. For example, 13 does not divide evenly so it not a perfect square.
No, it is not.
15,000 is already a whole number. A whole number is any number that is not a fraction or decimal. 15,00.96 would not be a whole number, but a decimal.