How do I get the 6 digit number to pair my watch. It only gives me a 5 digit number?

Hi

When pairing manually, you need to tap on the 5-digit name on the screen of your iPhone (when it shows the same device name as that which is shown on your watch, after you have tapped on "i" on your watch):

Your watch will then display a six-digit code, which you next need to enter on your iPhone:

More information:

Set up your Apple Watch - Apple Support

Be sure to tap the 5-digit number on the screen of your iPhone, not on your watch.

Before trying again to pair your watch, it may help to close all open apps on your iPhone and then to restart both devices:

• On your iPhone, double-click on the Home button, then swipe up on each app preview to close it;
• Turn both devices off together, then restart your iPhone first;
  • To turn your watch off: press and hold the side button until you see the Power Off slider; drag it to turn off.
  • To turn it back on: press and hold the side button until you see the Apple logo.

You may then also be able to follow the standard pairing process, without needing to pair manually:

Set up your Apple Watch - Apple Support

If the issue then persists, I suggest that you contact Apple Support or make a Genius Bar reservation for assistance:

Contact - Official Apple Support

https://twitter.com/applesupport

http://www.apple.com/retail/geniusbar/