Alright, let's work through 1509 times 4431 step by step
1509 × 4431 = 4431 × (1509)
+ 4431 × 9 what gives us 39879
+ 4431 × 00 that results in 0
+ 4431 × 500 that equals 2215500
+ 4431 × 1000 resulting in 4431000

= 6686379
