Just to add a bit to what the above guys have said.............
Suede on furniture is generally called Nubuck.
Fabric "suede" look-a-likes may be called a number of names such as "Faux suede, Macro suede, Micro suede, Macro fibre, Micro fibre" and any other names that the manufacturers want to give them.
As said above, open a zipper and look at the reverse side (inner side) of the cushion.
If it has a pattern similar to cotton sheets (criss/cross), it will be fabric.
If it has a raw, hide look, it is probably Nubuck.
Be especially aware of the new Chinese look-a-likes now flooding the market.

The fabrics can easily be cleaned with a wet system, depending on your expertise with fabric furniture.
If you have never done a leather course, RUN........................ & recommend a knowledgeable leather cleaner to the custard.
Shorty.