This is a very vauge question, but I would suggest you try the Inverse Symbolic Calculator, which you can find here.
RonL
Use your calculator.
If the number is the square root of something, then square the number to to transform it back to its radical form
Like, n = the number,
So, sqrt(n^2) is its radical form.
If n is cube root of something.
cuberoot(n^3) is its radical form.
etc...
You may do some rounding off if you are looking for integer inside the radical sign.