do number four in roman numerals is always be written as IIII instead of IV in every conditions

No, the number four in Roman numerals is almost always written as "IV" and not "IIII" under standard conditions. This notation adheres to the subtractive principle of Roman numerals:

• "I" represents 1
• "V" represents 5

By placing "I" before "V," it signifies 5 minus 1, which equals 4 (V - I = IV).

The use of "IIII" for the number four is not standard in Roman numerals. However, there is a historical and aesthetic exception found on traditional clock faces, where "IIII" is often used instead of "IV" to maintain a consistent look with the other numerals on the clock that are all composed of horizontal lines (I, II, III, V, VI, etc.), which can make the clock face more visually balanced.

In all other contexts, the correct and universally accepted way to write the number four in Roman numerals is "IV."