Just try it.

>perl -e"use Data::Dumper"

>perl -e"use Data::Flumper"
Can't locate Data/Flumper.pm in @INC (@INC contains ...) at -e line 1.
BEGIN failed--compilation aborted at -e line 1.
[download]

A quick way to check the version is to require a high version.

>perl -e"use Data::Dumper 99"
Data::Dumper version 99 required--this is only version 2.121_14 at -e 
+line 1.
BEGIN failed--compilation aborted at -e line 1.
[download]