Without delay, let's solve this. We've got 604 and we will be multiplying it by 6, that is, adding 604 to itself 6 times.
Step 1: 0 + 604 = 604
Step 2: 604 + 604 = 1208
Step 3: 1208 + 604 = 1812
Step 4: 1812 + 604 = 2416
Step 5: 2416 + 604 = 3020
Step 6: 3020 + 604 = 3624

So, 604*6 = 3624