Resposta:

1524 = 2 . 2 . 3 . 127 --> [tex]2^{2}[/tex] . 3 . 127

620 = 2 . 2 . 5 . 31 --> [tex]2^{2}[/tex] . 5 . 31

921 = 3 . 307

5108 = [tex]2^{2}[/tex] . 1277