It is the multiplicative identity of numbers in most sets.
It can also mean the "most important" element or member.
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A prime number is a positive integer with two factors: one and the number itself.
An irrational number is one that cannot be expressed as a ratio of two integers.
It means one hundred and thirty one. There is no hidden meaning.
The quotient is the answer in a division problem.
An even number really has no meaning