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3 squared is 9 and 4 squared is 16, so the square root of any whole number between 9 and 16 will be irrational.
The square root of 14 is irrational. Three squared is 9, and four squared is 16; so square root of 14 is in-between 3 and 4.
4/25 squared is 16/625 = 0.0256 . That's a perfectly rational number.
Sometimes. eg the irrational number √2 squared is 2 which is rational (2 = 2/1) eg the irrational number √(√2) squared is √2 which is irrational.
5 squared is 5*5 is 25. 25 is not an irrational number.