I have a cricket based portal check here cricket scores This site has near to millions pages.

But is it advisable to have a multiple sitemaps in the website or not?

if Yes, what Name shall we give for the second site map? sitemap2.xml does this work?

Some where in the blog i have read that each sitemap should not have more than 1000 links, for better indexing, is this true?

+1  A: 

There's a concept of sitemap indexes: they list all the sitemaps your website has.

Anton Gogolev