Is a multimeter with 1,200,000 counts actually a 6½ digit multimeter?
The 1.999999 is already a lie. A 6.5 digit meter should have \$10^{6.5}\$ = 3162377 "counts". 

So, extending the lie, meters that have 3999 counts are described as 3-3/4 digit, when in fact they're barely 3.5 digit. 

Lies, damn lies, and marketing. Maybe a class action suit is in order if you can claim you were hoodwinked by their fake "marketing digits". 

To answer your title question, the meter in question is a 6.08 digit multimeter if it has 1,200,000 counts.