There are many number systems. The real numbers, the rational numbers, the complex numbers and some more esoteric ones such as p-adic numbers are all number systems.
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The biggest advantage of the Hindu-Arabic number system over any other ancient number systems is its inclusion of a 0 figure which made numeracy calculations easier and quicker.
Any number that can be divided equally by any other number is called "composite", in other words, it is "composed" of its own divisors.The opposite, a number that cannot be divided by any other number apart from itself and 1, is a "prime" number.
Their are two types of number systems. 1. Non positional number systems 2. Positional number systems.
For the same reasons other civilisations use them. To calculate.
No. The LCM of 2 and any other even number is the other number.