Is 981 a prime number?
It is possible to find out using mathematical methods whether a given integer is a prime number or not.
For 981, the answer is: No, 981 is not a prime number.
The list of all positive divisors (i.e., the list of all integers that divide 981) is as follows: 1, 3, 9, 109, 327, 981.
For 981 to be a prime number, it would have been required that 981 has only two divisors, i.e., itself and 1.
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As a consequence:
- 981 is a multiple of 1
- 981 is a multiple of 3
- 981 is a multiple of 9
- 981 is a multiple of 109
- 981 is a multiple of 327
For 981 to be a prime number, it would have been required that 981 has only two divisors, i.e., itself and 1.
Is 981 a deficient number?
Yes, 981 is a deficient number, that is to say 981 is a natural number that is strictly larger than the sum of its proper divisors, i.e., the divisors of 981 without 981 itself (that is 1 + 3 + 9 + 109 + 327 = 449).