Let's roll up our sleeves and solve this. We have 662 and we're going to multiply it by 6, essentially adding 662 to itself 6 times.
Step 1: 0 + 662 = 662
Step 2: 662 + 662 = 1324
Step 3: 1324 + 662 = 1986
Step 4: 1986 + 662 = 2648
Step 5: 2648 + 662 = 3310
Step 6: 3310 + 662 = 3972

So, 662*6 = 3972