You can use file to check 
$ file `which perl`
/usr/bin/perl: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), fo
+r GNU/Linux 2.6.8, dynamically linked (uses shared libs), stripped

[download]

In reply to Re: Is my perl install 32-bit or 64-bit? by zwon
in thread Is my perl install 32-bit or 64-bit? by mwans

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