It looks like a screw on freewheel.
You will need the correct removal tool for the make of the freewheel.
It will fit in the space behind the nut and using an adjustable spanner or a large ring spanner it will unscrew.
As it looks to be oldish, it may take a bit of effort.
You could take the wheel to your local bike shop, LBS, and they will remove it for you.
Blimey that is rusty. Recent purchase “project bike”? Can you see the notches on outside of nearest ring. Six notches from what I can see. You want a tool to fit that.
You may need a peg tool, or go in more destructive. Does it say 'Falcon' on the inner edge. Be easier to see what we're dealing with if you can clean the centre around the axel up.
Even freewheels with splines and a decent tool can be a nightmare to remove. I used to use a big adjustable, with the end of the garden rake attached, so had a 6 foot spanner...
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