No, they are factors.
You can have three common multiples, but only one can be least and that's 126. Others include 252 and 378.
The only Least Common Multiple (LCM) for 7 9 14 is 126.
126, 252, 378
The least common multiple of 28 , 126 = 252
126, 252 and 378.
126, 252, 378 and so on.
126, 252, 378
The least common multiple of 21 , 84 , 126 = 252
126, 252, 378 . . .
126, 252, 378
63, 126, 189, 252, 315 . . .