No, it has 5. The 0 at the end is not a place holder and so is (or should be) an indicator of the precision of the number. In that case it is also a significant figure.
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302.5
That one has five.
241.9956 rounded to four significant figures is 242.0
Four significant figures.
The answer is 0.059 as the four significant figures are 0,0,5,9.