Yes, it's just a number referenced in one of a few databases.
> The 15-digit pet microchip is the international standard (see ISO 11784:1996 and ISO 11785:1996)
https://www.aaha.org/for-veterinary-professionals/microchip-...
> The 15-digit pet microchip is the international standard (see ISO 11784:1996 and ISO 11785:1996)
https://www.aaha.org/for-veterinary-professionals/microchip-...
Except the United States, because of course.
ISO is 134 kHz, US has both 125 and 128 kHz.