How many Jews does Hannah say are killed by the Nazis?

Hannah says that six million Jews were killed by the Nazis.

"The men down there," she cried out desperately, "they're not wedding guests. They're Nazis. Nazis! Do you understand? They kill people. They killed—kill— will kill Jews. Hundreds of them. Thousands of them. Six million of them! I know. Don't ask me how I know, I just do.