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Where is the number six plug on a 1999 Chevy Suburban?

There is no "number six" spark plug in a 1999 Chevy Suburban. The Suburban's engine (likely a V8) uses a firing order, and the plugs are identified by their cylinder number, not a sequential number like 1-6. You'd need to consult a repair manual specific to your Suburban's engine (e.g., a 5.7L Vortec or a 7.4L big block) to find the location of each cylinder's spark plug. The manual will show a diagram with the firing order and plug locations.