Some nouns change their spelling when they become plural.
Some nouns have the same form whether they are singular or plural.
The only plurals formed with apostrophes are the plurals of numbers, letters, and words highlighted as words. Here are some examples:
How many 3’s make 9?
Be sure to mind your p’s and q’s.
Some words from other languages form plurals in other ways, often determined by the laws of the language of their origin. Here are some examples: