1.98 GB is how many MB

A GB is 1000 MB. So 1.98GB is 1980MB.

Making things more complicated is that fact that actually 1 GB is 1024MB, but the two figures 1000 and 1024 get interchanged and mixed-up by manufacturers (including on your Hard-Drive Capacity info in Windows - it actually varies in different parts of Windows, the mix-up is that common.
Therefore 1.98GB could actually be anything from 2027MB down to 1933MB (and that's before we even get into whether that's a 1000KB or a 1024KB measurement of a MB!)
That's why people find their new iPod or Portable Hard-Drive or USB memory stick or whatever, seems to have less capacity than advertised.

The best solution is to simply go by the 1000 x figure and expect it to be an approximation.