$162 = $ ?

$2 \times 3^{2}$ $2 \times 3^{5}$ $2 \times 3^{4}$ $2 \times 3^{4} \times 13$ $2 \times 3^{4} \times 17$

$105 = $ ?

$3 \times 5 \times 7 \times 13$ $3 \times 5 \times 7 \times 17$ $2 \times 3 \times 5 \times 7$ $3 \times 5 \times 7 \times 11$ $3 \times 5 \times 7$

$420 = $ ?

$2^{2} \times 3 \times 5 \times 7^{2}$ $2 \times 3 \times 5 \times 7$ $2^{2} \times 3 \times 5 \times 7 \times 19$ $2^{2} \times 3 \times 5 \times 7 \times 11$ $2^{2} \times 3 \times 5 \times 7$

$56 = $ ?

$2^{3} \times 5 \times 7$ $2^{3} \times 7 \times 11$ $2^{4} \times 7$ $2^{3} \times 7$ $2^{3} \times 7 \times 17$

$891 = $ ?

$3^{4} \times 5 \times 11$ $2 \times 3^{4} \times 11$ $3^{4} \times 11$ $3^{4} \times 11 \times 17$ $3^{4} \times 11^{2}$