The seven commonly used Roman numerals have the following values...
I = 1
V = 5
X = 10
L = 50
C = 100
D = 500
M = 1000
However by placing a horizontal line above a numeral its value is multiplied by 1000, similarly by enclosing a numeral in brackets its value is also multiplied by 1000.
So [M] = 1000,000 and placing a horizontal line above it would increase its value to 1000,000,000. In the rules of writing Roman numerals you are allowed to repeat a numeral three times in succession so, the numeral [MMM] with a horizontal bar above it would have a value of 3000,000,000
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That is not a valid combination of Roman Numerals, so it isn't a number.
M=1000 anything larger requires a combination of numerals
Roman numeral symbols are written from highest to lowest and from left to right. The equivalent to 559 in Roman numerals is DLIX. The number 558 is DLVIII and 560 is DLX.
1666 = MDCLXVI
MCMLXXXVIII is the number 1988 in roman numerals. This number is a combination of various alphabets having their own meaning.