138 is divisible by 6. Any number is divisible by 6 if it is an even number that also is divisible by 3.
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1. Sum of digits (12) is divisible by 3, so number is divisible by 3 2. It's an even number so it's divisible by 2 3. If it's divisible by both 3 and 2 then it's divisible by 3 x 2, ie 6.
102, 108, 114, 120, 126, 132, 138, 144, and 150
138 x 6 = 828
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6 is not divisible by 162. 162 is divisible by 6.