# is_perfect_power Return `1` when `$x` is a perfect power `$a ** $b` with `$b > 1`. ## Synopsis ```perl Math::GMP->new(27)->is_perfect_power; # 1 (3**3) Math::GMP->new(28)->is_perfect_power; # 0 ``` Returns `0` otherwise. Detects any exponent — squares, cubes, fifth powers, and so on.