Alright, let's work through 6647 times 978 step by step
6647 × 978 = 978 × (6647)
+ 978 × 7 what gives us 6846
+ 978 × 40 that results in 39120
+ 978 × 600 producing 586800
+ 978 × 6000 giving us 5868000

= 6500766
