Prada's font is called Prada Candy.
It has been developed specifically for the brand and is therefore not available for public use. You can read more about Prada Candy:
- On TypeToken
- On the designer's website
Prada Candy is not available to the public and is only licensed to be used by Prada itself.
However there are similar fonts, such as:
- Luxury Diamond
- Engravers Roman Bold BT.
Luxury Diamond looks identical to the official Prada font, and Engravers Roman Bolt BT is similar except for the letter "A".
Remember that a lot of fonts cannot be used commercially unless you purchase a commercial licence from the designer.