What is the number of 3,000,000 escapees from Egypt based on?
I'm sure exactly where the 3,000,000 comes from. But according to Genesis 12:37-38 there were "about six hundred thousand men on foot, besides women and children"
And that number does not include any non israelites.
So if you figure 600,000 adult MEN. You can probably assume about 600,000 adult Women.
And since most families tried their best to have as many children as possible, you might be able to assume about 2 children per adult male. (I'm pulling numbers out of the air here fyi.)
So by my crappy calculations you got 600,000 men, 600,000 women, and 1,200,000 children. And that does not include the non israelites who came with them, which are just called a 'mixed multitude'.
Some people in an effort to explain the absurdly large number away make the claim that this scripture actually meant 600,000 FAMILIES, thus negating those extra women and children and bringing the number down from several million to several hundred thousand.
But as was stated, there is NO evidence outside the bible that this even happened so we have nothing to go on to get accurate numbers that what is included in the bible itself.
We can't, for example, find a pile of human feces in the desert that indicates a camp of 3,000,000 people slept there for a night, because no such pile of feces has ever been found.