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999 is greatest.
997 is the biggest 3 digit Prime number.
The greatest or largest 3 digit number is 999 because the next digit on the number line is 1000 a 4 digit number.
The largest 3-digit number is 999. To check if it is a multiple of 3, you can sum the digits: 9 + 9 + 9 = 27, which is divisible by 3. Therefore, 999 is the largest 3-digit number that is a multiple of 3.
That would be 999.