2048: 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/2048 - from package: 2048-cli

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

Error in other languages:
2048: bevel nie gevind nie
2048: comandă negăsită
2048: comando não encontrado
2048: commande introuvable
2048: command not found
2048: käsku ei ole
2048: không tìm thấy lệnh
2048: komanda nerasta
2048: Kommando nicht gefunden.
2048: kommandot finns inte
2048: komut yok
2048: nie znaleziono polecenia
2048: níor aimsíodh an t-ordú
2048: no se encontró la orden
2048: no s'ha trobat l'ordre
2048: opdracht niet gevonden
2048: parancs nem található
2048: perintah tidak ditemukan
2048: príkaz nenájdený
2048: příkaz nenalezen
2048: команда не найдена
2048: командата не е открита
2048: 命令找不到
2048: コマンドが見つかりません