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No, they are not.
I would say that base 10 is most common, with Arabic numerals, that is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
No, the Roman Numerals are a based less number system.
The number system that came after Roman numerals is the Hindu-Arabic numeral system, also known as the decimal system. It is based on ten symbols (0-9) and the positional notation principle, which allows for the representation of numbers of any magnitude using a combination of these symbols. This system is widely used today.
Roman numerals were common up until the 14th century. However, the Hindu-Arabic system, which replaced it, was first introduced in the 10th century, and was derived from the Indian numeral system first used in the 5th century. The Roman system started in around 400 BC but the system we use today didn't arrive until the 1st century AD (albeit without subtractive notation such as IV). There have been other numeral systems, including positional notation systems, that pre-date the Romans, as far back as 1,500 BC.