It's a two piece axle. You have an axle shaft and an axle flange. No great mystery here, Chrysler used this setup till 64 in pass cars, later in trucks.

You have to remove the nut to pull the flange.
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You have to pull the flange to unbolt the bearing retainer to pull the shaft.

You will need a GOOD puller to get the hub off. The kind you use a 5lb sledge on.

When I did this to my 51 Plymouth I had to let the puller sit overnight under pressure before I could get passenger side flange off.

This is the puller

https://www.amazon.com/gp/product/B074QQCTH8/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1