Numbers 2:32 These are those which were numbered of the children of Israel by the house of their fathers: all those that were numbered of the camps throughout their hosts were six hundred thousand and three thousand and five hundred and fifty. [kjv]
The book of Numbers is named for the detailed
census appearing in Numbers 2. The details can be boring but are part of an "
algorithm" provided by God for their camp in the desert.
If the Israelites in the desert had followed the "
algorithm" provided by God as how to precisely camp, their camp would have been laid out in the shape of a cross from the point of view of the "
rising sun" in the morning.
Notice the top-down nature of the reporting with the summary totals first and then the details.