Marvel fans know how the “prime” Marvel comics universe is referred to as the “616” universe, and now it appears that the MCU will use the same identification for the “prime” MCU in the new multiverse that is being established after the events of Avengers: Endgame.
Today on the Ellen show, Jake Gyllenhaal appeared to talk about Spider-Man: Far From Home and brought an extended clip of the scene from the trailer where Beck and Peter meet. In the extended dialog, it’s established that the MCU is set in Earth 616:
“There are multiple realities, Peter. This is Earth Dimension 616, I’m from Earth 833. We share identical physical constants, level four symmetry.”
You can see an off-screen version of the clip below: