prime: 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/prime - from package: gnudos

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

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