prody-2: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/prody-2 - from package: python2-ProDy

You may install the required package with command yum install {package}

Error in other languages:
prody-2: bevel nie gevind nie
prody-2: comandă negăsită
prody-2: comando não encontrado
prody-2: commande introuvable
prody-2: command not found
prody-2: käsku ei ole
prody-2: không tìm thấy lệnh
prody-2: komanda nerasta
prody-2: Kommando nicht gefunden.
prody-2: kommandot finns inte
prody-2: komut yok
prody-2: nie znaleziono polecenia
prody-2: níor aimsíodh an t-ordú
prody-2: no se encontró la orden
prody-2: no s'ha trobat l'ordre
prody-2: opdracht niet gevonden
prody-2: parancs nem található
prody-2: perintah tidak ditemukan
prody-2: príkaz nenájdený
prody-2: příkaz nenalezen
prody-2: команда не найдена
prody-2: командата не е открита
prody-2: 命令找不到
prody-2: コマンドが見つかりません