Function: issquarefree
Section: number_theoretical
C-Name: gissquarefree
Prototype: G
Help: issquarefree(x): true(1) if x is squarefree, false(0) if not.
Description:
 (int):bool       issquarefree($1)
 (gen):gen        gissquarefree($1)
Doc: true (1) if $x$ is squarefree, false (0) if not. Here $x$ can be an
 integer or a polynomial.
 The function accepts vector/matrices arguments, and is then applied
 componentwise.
Variant: For scalar arguments $x$ (\typ{INT} or \typ{POL}), the function
 \fun{long}{issquarefree}{GEN x} is easier to use.
