Hello @Kikia,
there isn't such a thing as a central european population register so far. So every national authority has to investigate whether your family status does comply with the requirements of marriage. As an example see ****://tinyurl.***/mp3evze (German language).
If you want to learn more about national rules on marriage in Europe, see this informations given by the EU: ****://tinyurl.***/88fbumo
Best regards
Jan