King Solomon did marry non-believer wives for his kingdom alliances. But many of them still prayed to their Baals.
Yes
As per 1 Cor. 7:14, For the unbelieving husband has been sanctified through his wife, and the unbelieving wife has been sanctified through her believing husband.
No
It is better not to marry an unbeliever so that quarrels and religious beliefs will not be the root of their misunderstanding.