On Android, how big can PDF be for reading?

I have Samsung Galaxy s4 mini, Android 4.4.2.  I have a PDF file that's about 400 pages and 2.6 Meg.  I'm thinking that it could be big for reading on the Android -- that moving around in the file may be cumbersome due to its size.  (I haven't tried it yet.)  I think I've opened smaller PDF files before without having a separate app.  If I do it that same way, how will the system handle the big file?

1-Should I break the file up into smaller files (which I could do on my desktop computer and then put them on the Android)?

2- Should I use a separately downloaded Adobe App to handle the file on the Android?

Thanks