For factoring and determining primes it's not that I'm a mathematical genius (though I AM somewhat above average), but I use the factor command-line program that comes with the "Miracl" numerical library:
Yes. Click Edit, then where it says (Save) (Go Advanced) (Delete) (Cancel), you can ... well, maybe you can figure it out from there, but you do have to select the "Delete Message" radio button for the Delete This Message button to be activated.
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