Usually a unique accession or catalog number used to track an object through time, from its acquisition to its digitization.
Likely indicates this is the 98th image in a series, perhaps part of a large photographic collection or a multi-page document.
In an archival context, a filename like often tells a "story" of historical preservation:
Based on the filename provided, this appears to be a digital artifact from an archival or museum collection. While there is no widely known folklore or public "story" specifically attached to this exact alphanumeric string, the naming convention is typical for items documented by institutions such as the or the Library of Congress .
