I donot understand that how static routing is more secure than dynamic routing?

My other question is that in static routing ,what we do is simply enter the information regarding the neighbouring Router in the routing table of our Router ,but if the remote network connected to the neighbouring Router fails or if any route in the routing table of the neighbouring Router gets down, then does this Router automatically informs our Router about this route or network failure or we have to manually update the routing table of our Router with it?

I hope my question is clear