There is no symbol to distinguish a Prime number from a composite. However, the single apostrophe symbol is used to denote prime in the context of the derivative of a function (or sometimes another value).
For example, f'(x) is the derivative of f(x) with respect to x.
Or, suppose x and x' are two points on the line L.
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What mathematical symbol? Different symbols were invented in different times and places.
"why" is not a mathematical symbol.
It's a mathematical metaphor.
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