test for factored integer form
This function will return true if expr is an expression of the form returned by the function ifactor, and false otherwise.
The numbers 0, 1, and −1 are considered to be of type facint, but all other integers and rationals must be passed through ifactor before type/facint will return true when applied to them.
a ≔ ifactor⁡2520
b ≔ ifactor⁡818
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