 One paraphrase view that has become somewhat popular recently holds that sentences that seem to be about numbers are best read as being about plurals. For instance, we might read ‘2 + 2 = 4’ as really saying something like this: two and two are four (or two objects and two (more) objects are four objects, or some such thing). Views of this general kind have been endorsed or defended by, e.g., Yi (2002, forthcoming), Hofweber (2005), and Moltmann (2013). This view fits better with ordinary usage than some of the other paraphrase-nominalist views, and for sentences like ‘2 + 2 = 4’ they can seem plausible. But when we switch to sentences like ‘3 is prime’ — and, even worse, ‘There are infinitely many primes’ — they can start to seem cumbersome and less plausible.