Alright, let's work through 1639 times 983 step by step
1639 × 983 = 983 × (1639)
+ 983 × 9 that is equal 8847
+ 983 × 30 resulting in 29490
+ 983 × 600 yielding 589800
+ 983 × 1000 that is equal 983000

= 1611137
