No, it is not.
No, they are not.
No, it is not.
The square root of 64 is 8, which is a rational number.
No. Radical(1.21) = 1.1, for example, is rational.
Yes, they are.
Sqrt(25) is -5 or +5, both of which are rational.
If the number inside the radical is a perfect square or a ratio of perfect squares.
The square root of 4 is 2 which is a rational number and also a prime number
It is not easy. If the value is rational then you must be able to express the value under the radical sign as p2/q2 where p and q are integers and q is non-zero. If not, then the number is irrational.It is not enough to require that for a rational, the number under the radical must be a perfect square since sqrt(2.25) is rational even though 2.25 is not a perfect square.
its the same as itself. since there is no radical part
15.556 is a rational number, so there is no sensible radical form.