Dumbbell push-ups are a good exercise to work your chest but you can add in a light dumbbell row to really work your core to the extreme while you get your chest and back.
This is not a mass building or strengthening exercise.
If you are looking to functionally train your core or just try something new this a fun and challenging exercise to choose.
Remember, if you are a man or woman, child or adult, your exercise program must include exercises such as squats, dead lifts, bench presses, pull-ups lat pulls, military presses, etc. to be successful.
Exercises such as this are supplementary and are best used sparingly.