Alright, let's work through 2644 times 1018 step by step
2644 × 1018 = 1018 × (2644)
+ 1018 × 4 giving us 4072
+ 1018 × 40 what gives us 40720
+ 1018 × 600 what gives us 610800
+ 1018 × 2000 that equals 2036000

= 2691592
