The L.C.M of 22, 54, 108, 135 and 198 is

 22 = 2 x 11

 54 = $2\times 33$

108 =  $22\times 33$

135 =  $33\times 5$ 

198 =  $2\times 32\times 11$

  $\therefore L.C.M = 22\times 33\times 5\times 11=5940$