Also certain things can be made easier (and faster) for you:
number_7 = input ("Please insert a number below 1,000,000:")
number_8 = input ("Please insert a number below 1,000,000:")
print "The sum of the 2 numbers is:", number_7 / number_8
Becomes
print "The sum of the 2 numbers is:", input ("Please insert a number below 1,000,000:") / input ("Please insert a number below 1,000,000:")
That's assuming you don't want to do anything with the variables after input.