thebrains***

honestly, i think you are off the track. the 2nd row must have a 9730&1 because all prime numbers end in those numbers, therefore you need them on the 2nd row. the 0 goes in the end square, and the top row numbers are 2468&5. the top number goes into the bottom number so keep multiplying it...a hint...the number multiplys by 2 to get the answer. you cant use an 8 6 or 5 because that will turn it into a 5 digit number... over and out