reverse engineering (dont blame me blame google)

Hi

Just discovered this forum and realize that i am totaly out of my depth here , so if it's possible i would just like to ask a queston which i have been wondering about for a long time now, it concerns
car radio codes form serial numbers, is it possible to work out the
formula for extracting codes using the examples below.
m083956=====2446
m336558=====9695
m316870=====2644
sorry about this dumb *** queston , if there is a solution a dummies guide would be needed for me ,don't know if this means reverse engineering ( google search words that got me here )but it's what i better do to get out of this forum before i get thrown out.
regards
AWOL
ps
1)would not be able to help anyone here, obvious !!!
2) all spelling mistakes are deliberaattee