use Scalar::Util 'looks_like_number';
use namespace::clean;


... looks_like_number($x) ...

##</code><code>##

use Scalar::Util ();


... Scalar::Util::looks_like_number($x) ...

##</code><code>##

use v5.20;
use experimental 'lexical_subs';
use Scalar::Util ();
my sub looks_like_number { &Scalar::Util::looks_like_number }

... looks_like_number($x) ...

##</code><code>##

use v5.20;
use experimental 'lexical_subs';
use Scalar::Util ();
my sub looks_like_number = \&Scalar::Util::looks_like_number;

... looks_like_number($x) ...