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The number is: 546+167 = 713
The multiples of 981 (which are infinite) are all divisible by 981, including these: 981, 1962, 2943, 3924, 4905, 5886, 6867, 7848, 8829 . . .
A prime number can only have two factors, 1 and itself. 713 has two other factors, 23 and 31, so is not prime.
713
A prime number is a number with two and only two factors: 1 (also known as unity) and itself. 981 has factors other than 1 and itself, so it is not a prime number. For example, it is divisible by 3. (You can check this by adding the digits of the number: 9 + 8 + 1 = 18. If the sum of the digits is divisible by 3, the number is also divisible by 3.) Therefore, 981 is a composite number.