You did not say if you want cmyk or not.
To check for objects that are NOT cmyk, you can go to Document menu/preflight and select "all objects not 4c or spot" and hit analyze.
To check if there's cmyk in the doc if you don't want any, go to Advanced menu/separation preview. If there's no cmyk in doc the values for c, m,y & k will read zero %.
Using OSX 10.3.9 on a G4 & G5