They are -2 3/4 and +2 3/4.
No, it is not.
The square root of seven is a real number, but it is not a whole number.
Sixteen is, itself, a whole number.
Yes. The square root of 49 is 7, because 7 * 7 = 49. Seven does not have a decimal and is therefore a whole number.
A perfect square is a rational number equal to the square of a whole number.
The square root of 16 is 4 which is a whole number.
16/4 is a whole number: 4
No, a square root doesn't have to be a whole number. The square root of 2.25 is 1.5. It could be said that most square roots are not whole numbers. Take just the first few integers (counting numbers). Find the square roots of the numbers 1 through 10 and you'll find three of the numbers have whole number square roots (1, 4 and 9). The other seven don't. For the numbers 11 through 20, there is only 1 number with a whole number square root (16).
When the whole number is a perfect square, ie it is a whole number squared.
16/6 is a mixed fraction and there is no way to express it as a whole number.
The square root of 15 is not a whole number.
A perfect square.