Your point is totally wrong infact laughable and depict ignorance. Millions ? even before dinasours lmao.
What average you are talking about ? huh ? seriously bro you lack historical information big time.
From the times inbetween Musa and ISA, there were 2-3 KNOWN Prophets as well which I can name. Musa AS married to one of the daughters of Prophet Shoaib AS, Haroon AS (Arun - Moses bro) was also revealed with prophecy by the God when Musa was on the mountains hence at the very same time. During the times of ISA there was another Prophet , John the Bapist aka Hazrut Yayha AS, who was Jesus AS uncle.
Also there have been many instances where multiple Prophets had known to exist at the same time. More such examples are of Hazrut Yaqoob AS (Jacob) and his beloved son Prophet Yosuf AS (Joseph). Not to forget Abaraham and Lut A.S. Only known gap is in between ISA AS and Prophet Muhammad AS which is 600 years but that's it. Get your logic regarding 'average' duration in between Prophets time period correct. As per your twisted logic, than one Prophet used to be designated to entire mankind lol hell no!!. Multiple Prophets used to exists at the same time at different locations on the world. Quran and other holy books usually talk about the Prophets which were local to Middle East , who knows about the Prophets which were sent in Europe, Central Asia, India, China or to the red indians of North and South America.
difference in between them of hundred of years ????? seriously bro....cant believe it you guys lack historical knowledge big time
and yeah another example Abraham AS, Issac AS and Ishmael AS but as per some PDFians, time gap is hundred of yearsssssssssssss lmao