No, the noun painters is the plural form of the singular noun painter.
The singular possessive form of the noun painter is painter's.
example: The painter's truck had a flat tire so he will be delayed.
The possessive form of the plural noun painters is painters'.Example: The painters' equipment was kept in the garage overnight.
painter's
The possessive form of the singular noun gallery is gallery's.Example: The gallery's hours are on their website.
The possessive form of the singular noun artist is artist's.Example: Some of this artist's works are worth millions.
Singular possessive of picture is picture's, e.g. the picture's value exceeded our wildest dreams.
The possessive form of the plural noun painters is painters'.Example: The painters' equipment was kept in the garage overnight.
"The painter's brush dropped to the floor." (The painter is singular, the brush is singular.)"The painters' brush dropped to the floor." (The painters is plural, the brush is still singular.)"The painters' brushes dropped to the floor." (The painters is plural, the brushes is plural.)
Quantum is singular, not singular possessive. The singular possessive form is quantum's.
Museum is singular. Museum's is singular possessive. Museums is plural. Museums' is plural possessive.
The singular possessive pronouns are "my," "mine," "your," "yours," "his," "her," and "its."
The singular possessive of dish is dish's
The singular possessive is Martin's.
The singular possessive is fish's.
Grave's is the singular possessive.
The singular possessive form of "test" is "test's".
Buzz's is the singular possessive.
The singular possessive is biker's; the plural possessive is bikers'.