Sometimes you will see a numeral with a line over it. That means to multiply it by 1000. A numeral X with a line over it means 10,000.
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The Roman numeral for ten is X
The Roman Numeral M is equal to 1000 One Thousand
It indicates multiplication by a thousand
M is a thousand and D is 500. An X is ten and an I is one. So this would be 1509.
The Roman numeral for 500,000 is |V| with a line over it. This numeral was introduced in the Middle Ages, after the end of the Roman civilisation.