It is difficult to give an exact number of languages in the world because:
* Defining "language" is complex: There are many different ways to define what constitutes a distinct language. Some languages have many dialects, and it's unclear where the line between dialect and language lies.
* Data collection is difficult: Many languages are spoken by small groups of people, and their documentation is limited.
However, estimates for the number of languages spoken today range from 6,500 to 7,100.
So, while 6909 is close to the range, it's not a precise figure.