555'"

I’m not sure what you mean by 555'. Could you tell me the subject or context? A few common possibilities:

• Calculus: If 555 represents a constant function f(x) = 555, then its derivative is 0, i.e., f'(x) = 0. So 555' would be 0 (with respect to whatever variable you’re differentiating with).
• Number theory: 555 is not prime; its factorization is 3 × 5 × 37.
• Minutes notation: Sometimes a prime symbol (’) is used informally to denote minutes, e.g., 555’ could be interpreted in a specific context, but that’s unusual here without more.

If you’re studying for an exam, tell me the course and topic (calculus, algebra, number theory, etc.), and I’ll tailor a quick explanation or give you practice problems.