the number 2 is the only even Prime number
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It is a prime number
It is approximately Avogadro's number which is the number of units (atoms, molecules, etc) in one mole of a substance.
infinity
The position of any number in a number line is determined by its distance from the zero.
There is no importance behind the number 991, unless an individual means 911. If that was the case, 911 is very important. It is used to call for an emergency and help.