Alright, let's work through 1587 times 4925 step by step
1587 × 4925 = 4925 × (1587)
+ 4925 × 7 that results in 34475
+ 4925 × 80 what gives us 394000
+ 4925 × 500 that equals 2462500
+ 4925 × 1000 resulting in 4925000

= 7815975
