How many languages do you speak?

We will have to distinguish between language and dialect.

It is understood by language, speech that has a literary body that has been formally standardized. As examples, we have the Indi, French Castilian and others.

Dialect is the speech of a geographically limited region in which a language is spoken with some variations in structure. 

The United Nations Organization (UN) has identified six official languages are:

   Arabic, Chinese, English, French, Russian and Spanish.

So easy to make yourself understood anywhere in the globe, only to have basic knowledge of these six languages.