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  1. or download this
    use Scalar::Util 'looks_like_number';
use namespace::clean;


... looks_like_number($x) ...
  2. or download this
    use Scalar::Util ();


... Scalar::Util::looks_like_number($x) ...
  3. or download this
    use v5.20;
use experimental 'lexical_subs';
...
my sub looks_like_number { &Scalar::Util::looks_like_number }

... looks_like_number($x) ...
  4. or download this
    use v5.20;
use experimental 'lexical_subs';
...
my sub looks_like_number = \&Scalar::Util::looks_like_number;

... looks_like_number($x) ...