Alright, let's work through 1642 times 4387 step by step
1642 × 4387 = 4387 × (1642)
+ 4387 × 2 producing 8774
+ 4387 × 40 producing 175480
+ 4387 × 600 which equals 2632200
+ 4387 × 1000 that results in 4387000

= 7203454
