On iPad Air, after viewing pictures on ,Pixable, number remains and will not go away

It is in the settings to delete after a number of emails have been read . You can change the number of emails and set a time limit for the iPad to keep your mail.

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Keyboard

Obstructions to signal?

Find iPad Mini IMEI number:
Navigate to settings-general-about, and scroll down to view your device's IMEI number and other details.
Device body and packaging
Check the back case of your iPad, and you'll find the IMEI number printed near the bottom. If you have the packaging too, look for the IMEI number on the barcode label.
ITunes
Connect your device to your Max or PC, fire up iTunes and click on your device name to open the summary. You'll see your devices name and capacity listed alongside an image of your model - simply click the field below the Capacity field once or twice, till it shows you the IMEI number. You can also right click the number to copy it.
How to find your iPhone or Cellular iPad IMEI number

Find iPad Mini IMEI number:
Navigate to settings-general-about, and scroll down to view your device's IMEI number and other details.
Device body and packaging
Check the back case of your iPad, and you'll find the IMEI number printed near the bottom. If you have the packaging too, look for the IMEI number on the barcode label.
ITunes
Connect your device to your Max or PC, fire up iTunes and click on your device name to open the summary. You'll see your devices name and capacity listed alongside an image of your model - simply click the field below the Capacity field once or twice, till it shows you the IMEI number. You can also right click the number to copy it.
How to find your iPhone or Cellular iPad IMEI number

I would suggest trying to close out the App by quickly double tapping the home button and then when the app comes up you want to close, sliding your finger from top to bottom or bottom to top to close out out selected app and see if that gets of rid of your numbers showing issue, it seem that it is residual artifacts from the app.

on the backside of the iPad is a model number:

Model iPad (1st generation) iPad 2 iPad (3rd generation) iPad (4th generation) iPad Air iPad Air 2 Picture Model Number[99] A1219 (Wi-Fi)
A1337 (Wi-Fi + 3G) A1395 (Wi-Fi)
A1396 (GSM model)
A1397 (CDMA model) A1416 (Wi-Fi)
A1403 (Wi-Fi + Cellular (VZ))
A1430 (Wi-Fi + Cellular) A1458 (Wi-Fi)
A1460 (Wi-Fi + Cellular (MM))
A1459 (Wi-Fi + Cellular) A1474 (Wi-Fi)
A1475 (Wi-Fi + Cellular) A1566 (Wi-Fi)
A1567 (Wi-Fi + Cellular How to find iPad IMEI ICCID serial number
http://en.wikipedia.org/wiki/List_of_iOS_devices#iPad

There is no way to upload pictures from your iPad using a website and the safari browser. Your best bet is to download the eBay app from the App Store and create your listing and upload your photos through the official eBay app itself.

check the model nr. on the back side:
Apple Device Model Number
1iPad Wi-Fi (Original/1st Gen)A12191
iPad Wi-Fi/3G/GPS (Original/1st Gen)A13371
iPad 2 (Wi-Fi Only)A13951
iPad 2 (Wi-Fi/GSM/GPS)A13961
iPad 2 (Wi-Fi/CDMA/GPS)A13971
iPad 2 (Wi-Fi Only, iPad2,4)A13951
iPad 3rd Gen (Wi-Fi Only)A14161
iPad 3rd Gen (Wi-Fi/Cellular AT&T/GPS)A14301
iPad 3rd Gen (Wi-Fi/Cellular Verizon/GPS)A14031
iPad 4th Gen (Wi-Fi Only)A14581
iPad 4th Gen (Wi-Fi/AT&T/GPS)A14591i
iPad 4th Gen (Wi-Fi/Verizon & Sprint/GPS)A14601
iPad Air (Wi-Fi Only)A14741
iPad Air (Wi-Fi/Cellular)A14751