Is 3991 is a composite number or not?
- As we already know that, the number having factors 1 and the number itself is the prime number.
- And numbers having more than these two factors are the composite numbers.
- To check whether the number 3991 is composite or not first we have to find its factors.
Contents
Factors of 3991:
- If we have taken numbers from 1, 2, 3…for checking factors of 3991, we found that 3991 has factors 1, 13, 307 and 3991. Hence, we must say that 3991 is a composite number.
- Thus, 3991 is the composite number.
- If we multiply 3991 by 1, 2, 3 then we get the multiples of 3991 which are 3991, 7992 and so on.
3991 is a Composite number or Prime number
About the number 3991:
- 3991 has more than two factors which are 1, 13, 107 and 3991 and hence it is the composite number.
- 3991 is the odd composite number and it is not the perfect square also.
- If we divide 3991 by 1, 13, 107 and 3991 then we get remainder as zero. Hence 1, 13, 107 and 3991 are the factors of 3991
Note:
- 3991 is not the perfect square.
- Factors of 3991:1, 13, 107 and 3991
- Prime factors of 3991: 13, 107
Conclusion:
- 3991 is the composite number which has factors 1, 13, 107 and 3991.
- And hence, 3991 is not the prime number.
Multiple Choice Questions:
1) 3991 is a
a) odd number
b) Prime number
c) even number
d) Both a and c
Ans: a) odd number
2) The non-prime factors of a composite number 3991 are
a) 1
b) 13, 107
c) 1, 13, 107 and 3991
d) 1 and 3991
Ans: d)1 and 3991
3) 3991 is the odd composite number because
a) It has factors 1, 13, 107 and 3991
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all
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