Because the ancient Romans would never have displayed the equivalent of 4 as IV for fear of offending their god Jupiter.
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Clocks do not always show the number 4 in this way. However, the stricter rules which modern society applies to the expression of Roman numerals are only a fairly recent change. back when Roman numerals were being etched on Roman buildings, it was not uncommon to see a number such as 400 expressed as CCCC, even though today we would express it as 100 before 500, i.e. CD. See http://www.web40571.clarahost.co.uk/roman/howtheywork.htm for more about the history and rules of Roman numerals.
The state that has four Roman numerals in its name is Massachusetts.
Four in Roman Numerals is IV.
CD
Four million in Roman numerals is MMMM but with an horizontal bar above each of the four numerals to indicate multiplication by a thousand (4000*1000 = 4000000)