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Is a year a common or proper noun? For example, in the following sentence, is 1994 a common noun?

In 1994, the city council approved the project.
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Numbers are usually common nouns (when they are actually used as nouns, that is. Be careful because numbers can also be adjectives and pronouns).

If you say, for example, "Three is a five-letter word", "three" is a noun, a common noun.
If, on the other hand, you say "I have three brothers", "three" is an adjective/determiner.

In your example, some authors would consider "1994" as a pronoun, replacing "the year 1994"; others, as a noun. If it is considered to be a noun, then it's a common one.

Miriam
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Students: We have free audio pronunciation exercises.

should numer names be written with a capital letter, for example 1-One or one

green cpu 901Should number names be written with a capital letter, for example 1-One or one?

In what sentence?