What is the Roman numeral for the number 500?

The Roman numeral for the number 500 is represented by the letter D. This numeral originates from the Latin word ‘demi’, meaning half, as 500 is half of 1000, which is represented by the letter M in Roman numerals.

C represents 100, M represents 1000, and V represents 5, which are all different values and do not correspond to 500. Thus, D is clearly the correct choice reflecting the value of 500 in the Roman numeral system.