In pure functional languages, is data (strings, ints, floats.. ) also just functions?

I was thinking about pure Object Oriented Languages like Ruby, where everything, including numbers, int, floats, and strings are themselves objects. Is this the same thing with pure functional languages? For example, in Haskell, are Numbers and Strings also functions?

I know Haskell is based on lambda calculus which represents everything, including data and operations, as functions. It would seem logical to me that a "purely functional language" would model everything as a function, as well as keep with the definition that a function most always returns the same output with the same inputs and has no state.