If the engine has an oil filler hole with a rudimentary dip-stick then it will be a 4 stroke.
If there is no filler hole it will be a 2 stroke
Engines for lawnmowers are usually made by specialist companies - Honda - Briggs & Stratton - some guys in China. In my experience they're always 4 stroke.
Look for the Oil Filler Hole...
June 2015