Alright, let's work through 1683 times 2391 step by step
1683 × 2391 = 2391 × (1683)
+ 2391 × 3 that is equal 7173
+ 2391 × 80 producing 191280
+ 2391 × 600 resulting in 1434600
+ 2391 × 1000 resulting in 2391000

= 4024053
