Is 1391 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 1391 is composite or not first we have to find its factors.
Contents
Factors of 1391:
- If we have taken numbers from 1, 2, 3…for checking factors of 1391, we found that 1391 has factors 1, 13, 107 and 1391. Hence, we must say that 1391 is a composite number.
- Thus, 1391 is the composite number.
- If we multiply 1391 by 1, 2, 3 then we get the multiples of 1391 which are 1391, 2782 and so on.
1391 is a Composite number or Prime number
About the number 1391:
- 1391 has more than two factors which are 1, 13, 107 and 1391 and hence it is the composite number.
- 1391 is the odd composite number and it is not the perfect square also.
- If we divide 1391 by 1, 13, 107 and 1391 then we get remainder as zero. Hence, 1, 13, 107 and 1391 are the factors of 1391
Note:
- 1391 is not the perfect square.
- Factors of 1391: 1, 13, 107 and 1391
- Prime factors of 1391: 13, 107
Conclusion:
- 1391 is the composite number which has factors 1, 13, 107 and 1391.
- And hence, 1391 is not the prime number.
Multiple Choice Questions:
1) 1391 is a
a) Even number
b) Prime number
c) Composite number
d) Both a and c
Ans: c) composite number
2) The non-prime factors of a composite number 1391 are
a) 1
b) 13, 107
c) 1 and 1391
d) 1, 13, 107 and 1391
Ans: b) 1 and 1391
3) 1391 is the odd composite number because
a) It has factors 1, 13, 107 and 1391
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all