Washing dried semen
Q: I had released semen at night which had dried on my private area when I woke up in morning. When I did ghusl, the dried semen was not coming out, even after scratching or rubbing the skin. I left it and completed my ghusl, and offered fajr. This dried semen did not come out until I scratched it again after a week, and even then I think it did not come out completely.
1. Does this dried semen keep me impure?
2. Will I have to repeat the prayers I offered with this?