Alright, let's work through 1985 times 1624 step by step
1985 × 1624 = 1624 × (1985)
+ 1624 × 5 that is equal 8120
+ 1624 × 80 that is equal 129920
+ 1624 × 900 yielding 1461600
+ 1624 × 1000 what gives us 1624000

= 3223640
