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If the value applied in the radical is not a perfect square, it is irrational. 25; 400; and 625 are perfect squares and are rational when applied in a radical.
The square root of 9 is irrational
The square root (radical) of 5 is about 2.2361 (an irrational number)
The square root of 42 is an irrational number
Sqrt(42) cannot be simplified.