What is this bike called
Serial numbers are not standard, each manufacturer has its own coding.
It looks your BMX is a Schwinn BMX produced by
https://en.wikipedia.org/wiki/Pacific_Cycle
Mass product coming form the East, built to entice people looking for an object that looks like a bicycle and works almost like a bicycle, but generally with low-tier components and manufacturing not always having higher standards and QC.
Final opinion: if you like it and you like the way it rides, then it is a great bike.