4ti2gmp: 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/lib64/4ti2/bin/4ti2gmp - from package: 4ti2

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

Error in other languages:
4ti2gmp: bevel nie gevind nie
4ti2gmp: comandă negăsită
4ti2gmp: comando não encontrado
4ti2gmp: commande introuvable
4ti2gmp: command not found
4ti2gmp: käsku ei ole
4ti2gmp: không tìm thấy lệnh
4ti2gmp: komanda nerasta
4ti2gmp: Kommando nicht gefunden.
4ti2gmp: kommandot finns inte
4ti2gmp: komut yok
4ti2gmp: nie znaleziono polecenia
4ti2gmp: níor aimsíodh an t-ordú
4ti2gmp: no se encontró la orden
4ti2gmp: no s'ha trobat l'ordre
4ti2gmp: opdracht niet gevonden
4ti2gmp: parancs nem található
4ti2gmp: perintah tidak ditemukan
4ti2gmp: príkaz nenájdený
4ti2gmp: příkaz nenalezen
4ti2gmp: команда не найдена
4ti2gmp: командата не е открита
4ti2gmp: 命令找不到
4ti2gmp: コマンドが見つかりません