Is the number system universal?

The positional decimal system is presently universally used in human writing. The base 1000 is also used (albeit not universally), by grouping the digits and considering a sequence of three decimal digits as a single digit. This is the meaning of the common notation 1,000,234,567 used for very large numbers.

Are numbers the same everywhere?

Nearly all cultures today use the same decimal, or base-10, number system, which arranges the digits 0-9 into units, tens and hundreds, and so on.