It depends on how you are using it in a sentence. For instance, I have so many soups in my cabinet. Or if you said I don't like this soup. plural and singular.
The word is traced to the French "broth" and the Latin "bread soaked in broth."
The same way you can spaghatti.
because you can't afford real soup
it depends on the size, mostly 24 in regular size, in the larger size it is 12