Is the predicate after many a week singular or plural

Is the predicate after many a week singular or plural

Answer: singular
Many a means "many" and more than one means "more than one". In a sense, they are plural, but when they are used as subjects, the predicate is usually singular
1、many a
Many a fine man has died in that battle
Many a ship has been wrecked on those rocks
Many a young man has tried and failed
Many a successful store has paid its rent happily
2、more than one
More than one man has been dismissed
More than one person is involved in this
If things don’t get better,more than one person is going to have to find a new job.
If things don't get better, it's not individuals who need a new job
Comparison:
Many boys like swimming
More than one student has read the book