Function: issquarefree
Section: number_theoretical
C-Name: issquarefree
Prototype: lG
Help: issquarefree(x): true(1) if x is squarefree, false(0) if not.
Description:
 (gen):bool       issquarefree($1)
Doc: true (1) if $x$ is squarefree, false (0) if not. Here $x$ can be an
 integer or a polynomial.
