Looks like it. Fiberglass?
What Stanley is saying is measure the tub...how deep is it ? It really looks like a standard 20 inch tub...or is that 18 inches...maybe 16.....I don't know , so you get to measure it. Then measure the door width with the door off, it may fit.
You will also need to take the plumbing apart under the tub...this includes the trap and tailpiece.
If all else fails...a sawzall will cut it into pieces, and buy a tub that fits through the door.