I don't even know what the central atom of a isoprene is. Does the rule above work when you don't have an odd number of carbons on the longest not necessarily straight backbone?
Isoprene received its trivial name before IUPAC was a thing, so don't try to apply current systematics there.
Origin according to: https://en.wiktionary.org/wiki/isoprene :
Coined (1860) by British chemist C. G. Williams, from iso- (“equal; different, isomeric”) + prop- (“three carbon prefix”) + -ene (“alkene suffix”).
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