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Click the attached image to enlarge.

There's more than one way to do it.  Choose an object, go into polygon subobject mode.  In to the Graphite ribbon, and under the "Selection" tab, you will find there are multiple ways to locate Ngons, or any polygon of specific sides.  On the left, in your "Select" menu there is a button to find all Non-QUads.  This one will find both Ngons and Triangles all at once.  However, at the right, under the By Numeric menu, is a way to select more specific forms of Ngon.  You can select equal to, less than, or greater than polygons with 4 sides (or the specific number of sides you put in there, but 4 is the default) on any selected object.

You should find the selection tools quite robust.

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