Is 1911 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 1911 is composite or not first we have to find its factors.
Contents
Factors of 1911:
- If we have taken numbers from 1, 2, 3…for checking factors of 1911, we found that 1911 has factors 1, 3, 7, 13, 21, 39, 49, 91, 147, 273, 637 and 1911. Hence, we must say that 1911 is a composite number.
- Thus, 1911 is the composite number.
- If we multiply 1911 by 1, 2, 3 then we get the multiples of 1911 which are 1911, 3822 and so on.
1911 is a Composite number or Prime number
About the number 1911:
- 1911 has more than two factors which are 1, 3, 7, 13, 21, 39, 49, 91, 147, 273, 637 and 1911 and hence it is the composite number.
- 1911 is the odd composite number and it is not the perfect square also.
- If we divide 1911 by 1, 3, 7, 13, 21, 39, 49, 91, 147, 273, 637 and 1911 then we get remainder as zero. Hence, 1, 3, 7, 13, 21, 39, 49, 91, 147, 273, 637 and 1911 are the factors of 1911
Note:
- 1911 is not the perfect square.
- Factors of 1911: 1, 3, 7, 13, 21, 39, 49, 91, 147, 273, 637 and 1911
- Prime factors of 1911: 3, 7, 13
Conclusion:
- 1911 is the composite number which has factors 1, 3, 7, 13, 21, 39, 49, 91, 147, 273, 637 and 1911.
- And hence, 1911 is not the prime number.
Multiple Choice Questions:
1) 1911 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 1911 are
a) 1
b) 3, 7, 13
c) 1, 21, 39, 49, 91, 147, 273, 637 and 1911
d) 1, 3, 7, 13, 21, 39, 49, 91, 147, 273, 637 and 1911
Ans: b) 1, 21, 39, 49, 91, 147, 273, 637 and 1911
3) 1911 is the odd composite number because
a) It has factors 1, 3, 7, 13, 21, 39, 49, 91, 147, 273, 637 and 1911
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all