No, 1900 is not a multiple of 400. The multiples of 400 are 400, 800, 1200, 1600, 2000, 2400, ...
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No - 1900/400 = 4.75
400 is one such multiple.
8400
Least Common Multiple (LCM) for 120 400 is 1,200
The Least Common Multiple (LCM) for 320 360 400 is 14,400.