The short answer is "probably not".
You can assess for yourself whether you have about 1 inch of extra room around your existing tires in the frame and fork. If so, there might be room for 14" wheels. Then there is the matter of brakes. If you have rim brakes, you'll have to be able to move the pads upward around 3/4" (which might require a different brake with shorter reach) AND the new tire must be able to pass through the brake.
If all these criteria are met, then you can switch to the larger wheel size. The bike will ride about 3/4" higher off the ground after the conversion.