Alright, let's work through 1022 times 622 step by step
1022 × 622 = 622 × (1022)
+ 622 × 2 that is equal 1244
+ 622 × 20 what gives us 12440
+ 622 × 000 resulting in 0
+ 622 × 1000 what gives us 622000

= 635684
