No problem, we've got 6431 and 261 to multiply
6431 × 261 = 261 × (6431)
+ 261 × 1 that is equal 261
+ 261 × 30 giving us 7830
+ 261 × 400 that is equal 104400
+ 261 × 6000 yielding 1566000

= 1678491
