555'"

I’m not sure what you’re asking with "555'". Could you clarify the context? Here are a few common interpretations and quick answers:

• If you mean 555 as a prime number (555′ or 555 prime): 555 is not prime. It factors as 3 × 5 × 37 (or 15 × 37).

• If the apostrophe denotes a derivative (f′) and you mean a constant function 555: 555′ = 0.

• If the apostrophe denotes arcminutes (as in angles): 555′ equals 555 arcminutes, which is 9 degrees 15 minutes (since 555/60 = 9.25 degrees).

• If the apostrophe denotes feet (feet symbol): 555′ means 555 feet.

If you can tell me the subject (math, physics, geometry, etc.) and what you’re trying to do (simplify, factor, differentiate, convert units, etc.), I can give a precise solution.