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sqrt 90 = sqrt 9 x sqrt 10 = 3 root 10. Root 10 is irrational so sqrt 90 is irrational.
Yes. In general, if an integer is not a perfect square, its square root is irrational.
No.
Please note that the square root of a negative number is an imaginary number. Many calculators are unable to calculate that.Take the square root of 90 (any calculator can do that). Then attach an "i" at the end of the number, to indicate the imaginary unit.
9.48683298 is the square root of 90