If you mean a whole number then no it would be a decimal number (2.236 recouring)
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The square root of 25 is 5 which is a rational number
It is a real but an irrational number
No, it is not even a real number. The square root of negative 5 is the square root of 5, times i.
X is greater than 5. If X were equal to 5, X-5 would be 0 which has no real square root. If X were 4, X-5 would be -1 which has no real square root, and so on.
Neither. It is not a real number but an imaginary number.