Let's calculate 1664 x 7421
1664 × 7421 = 7421 × (1664)
+ 7421 × 4 resulting in 29684
+ 7421 × 60 that results in 445260
+ 7421 × 600 giving us 4452600
+ 7421 × 1000 what gives us 7421000

= 12348544
