Alright, let's work through 1615 times 4027 step by step
1615 × 4027 = 4027 × (1615)
+ 4027 × 5 producing 20135
+ 4027 × 10 that is equal 40270
+ 4027 × 600 producing 2416200
+ 4027 × 1000 giving us 4027000

= 6503605
