Not necessarily. If the sides are a multiple of sqrt(2) units, then the diagonal is rational.
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If you mean the square root of two, then the answer is irrational. However, it is known as Pythagoras' constant. The square root of 2, in geometrical terms, is the diagonal of a square.
The length of the diagonal of any square whose sides are a whole number of units.
Square root of 10 is irrational.
The square root of 91 is an irrational number. This can be determined by showing that 91 is not a perfect square, meaning it cannot be expressed as the square of an integer. Since the square root of 91 cannot be simplified to a rational number, it is classified as irrational.
Irrational. Irrational. Irrational. Irrational.