When I ordered a set of three foot-long chicken parmesan sandwiches from Subway a few weeks ago, the guy behind the counter said, "Because prime numbers are fun

When I ordered a set of three foot-long chicken parmesan sandwiches from Subway a few weeks ago, the guy behind the counter said, "Because prime numbers are fundamentally connected with multiplication, understanding their additive properties can be tricky." I was confused at the time, but it makes sense now.