Question

6×4×66×9
$+ 55$

Answer 1

6×4×66×9+55

6×4×11×6×9+55

6×4×11×6×9+54+1

6(1×1+9)×4×11×9+1

6(10)×4×11×9+1

60×4×11×9+1

Since, there factor is other then 1

Hence, it is a composite number