This file is indexed.

/usr/share/runawk/isnum.awk is in runawk 1.6.0-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Written by Aleksey Cheusov <vle@gmx.net>, public domain
#
# This awk module is a part of RunAWK distribution,
#        http://sourceforge.net/projects/runawk
#    
############################################################

# =head2 isnum.awk
#
# =over 2
#
# =item I<isnum (NUM)>
#
# returns 1 if an argument is a number
#
# =back
#

function isnum (v){
	return v == v + 0
}