What European language, not Indo-European, is spoken by around 5 million people and is famous for having 15 grammatical cases and a complete absence of grammatical gender (neither masculine, nor feminine, nor neuter)?

Finnish belongs to the Uralic language family (like Estonian and Hungarian). It is famous for its complex case grammar: it uses 15 cases (such as the inessive, the elative or the illative) that are added as suffixes to the roots of words to express location, direction, possession, etc. Another notable characteristic is that it has no grammatical gender; the pronoun 'hän' means both 'he' and 'she'. Its agglutinative structure makes it very different from the Indo-European languages ​​that surround it.