No, the word 'seventeen' is a common noun, a general word for a number or an amount.
A proper noun is the name of a specific person, place, or thing; for example, Seventeen magazine or Seventeen Lakes(development) in Roanoke TX.
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
Pencil proper or common noun
Exxon is a proper noun
proper noun
seventeen is an adjective in this sentence
Yes, the word 'Ali' is a proper noun, the name of a person.A proper noun is the name or title of a specific person, place, or thing.A proper noun is always capitalized.
proper noun
Eighteen can be both an adjective, meaning one more than seventeen, or a noun meaning the cardinal number that is the sum of seventeen and one.
Proper noun
It is a proper noun, because it is the name of a specific thing.
Proper noun or common noun
it's a common noun. a proper noun would be Spider-Man.