Pedal axle measurement?
You have the normal standard omnipresent pedal type with a 9/16 inch thread. If the size is not specifically indicated, it almost certainly fits. You canfirm it by some crude measurement.
The manufacturer speaks about a 7 mm boron steel axle, but that is hidden inside, it is not the thread diameter.
The number on your pedal might be a date of manufacture or some batch number.