A number with a square root is still a number. So the answer is all of them.
No. The square roots 8 are irrational, as are the square roots of most even numbers.
Numbers with square roots that are whole numbers
They are called real numbers. Negative square roots must be complex numbers.
No. The square roots of perfect squares are rational.
A number with square roots that are whole numbers is called a perfect square. Examples include 1 (with square roots of ±1), 4 (with square roots of ±2), and 9 (with square roots of ±3). In general, any integer that can be expressed as the product of an integer multiplied by itself is a perfect square.
There are no real square roots of -256. But using complex numbers the square roots of -256 are 16i and -16i.
No. Lots of square roots are not rational. Only the square roots of perfect square numbers are rational. So for example, the square root of 2 is not rational and the square root of 4 is rational.
Negative numbers have no real square roots. In terms of complex numbers, the square roots of 43 are +j6.5574 (rounded) and -j6.5574 (rounded)
Rational numbers whose square roots are whole numbers are themselves whole numbers. They are called square numbers, e.g. 1, 4, 9, 16, 25 and so on.
There are no following numbers!
Square roots of negative numbers ARE possible. I guess you haven't been introduced to "imaginary numbers" and the letter "i".
Negative numbers do not have "real number" square roots.However, they will have two roots (when using imaginary numbers) as do other numbers, where a root including i(square root of -1) is positive or negative.