Yes, it is a noun. It's a noun because it's his name and he's a character on the show. A noun is a person, place, or thing.
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A proper noun is the name or title of a specific person, place, or thing.A proper noun for the noun phrase "favorite TV program" is the name of your favorite TV program, for example, "60 Minutes", "Spongebob Squarepants", "Downton Abbey", or whatever your favorite may be.
Spongebob Squarepants
i would say spongebob squarepants
SpongeBob SquarePants was first aired May 1, 1999.
Spongebob Squarepants is married to Kinealie Rutland