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.
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A radical is an exponent, stupid.
The square root of 9 is irrational
Yes, it is.
The square root (radical) of 5 is about 2.2361 (an irrational number)
surds:- if this is for the Mail on Sunday GK crossword YES IT IS