Alright, let's work through 1636 times 1566 step by step
1636 × 1566 = 1566 × (1636)
+ 1566 × 6 that results in 9396
+ 1566 × 30 producing 46980
+ 1566 × 600 that equals 939600
+ 1566 × 1000 that equals 1566000

= 2561976
