Yes, you can set the number of rows - columns in PC version of AutoCAD during creation in "Insert table" dialog.
But in AutoCAD for Mac there is no such dialog and you can set number of rows - columns during table creation only by dragging mouse (dynamically on screen) after you pick the insertion point.
In AutoCAD for Windows you cannot adjust the number of rows / columns in Properties palette as in AutoCAD for Mac.

Maxim