OK, let's crack this. We're given 591 and our task is to multiply it by 4. Essentially, we'll be adding 591 to itself 4 times.
Step 1: 0 + 591 = 591
Step 2: 591 + 591 = 1182
Step 3: 1182 + 591 = 1773
Step 4: 1773 + 591 = 2364

So, 591*4 = 2364