t4p=raw_input ('Enter a number and I will tell you if it is prime...')
div=2
while (div)<=int (t4p)/2: ##while div <= half of t4p run block
    if int (t4p)%(div)!=0: ## integer math with a remainder=potential prime
        (div)=(div)+1  ##add one to div
    else:
        print ('Not Prime')
        break
print ('Prime')

Enter a number and I will tell you if it is prime...Traceback (most recent call last):
  Line 1, in <module>
    t4p=raw_input ('Enter a number and I will tell you if it is prime...')
EOFError