Is 1491 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 1491 is composite or not first we have to find its factors.
Contents
Factors of 1491:
- If we have taken numbers from 1, 2, 3…for checking factors of 1491, we found that 1491 has factors 1, 3, 7, 21, 71, 213, 497 and 1491. Hence, we must say that 1491 is a composite number.
- Thus, 1491 is the composite number.
- If we multiply 1491 by 1, 2, 3 then we get the multiples of 1491 which are 1491, 2982 and so on.
1491 is a Composite number or Prime number
About the number 1491:
- 1491 has more than two factors which are 1, 3, 7, 21, 71, 213, 497 and 1491 and hence it is the composite number.
- 1491 is the odd composite number and it is not the perfect square also.
- If we divide 1491 by 1, 3, 7, 21, 71, 213, 497 and 1491 then we get remainder as zero. Hence, 1, 3, 7, 21, 71, 213, 497 and 1491 are the factors of 1491
Note:
- 1491 is not the perfect square.
- Factors of 1491: 1, 3, 7, 21, 71, 213, 497 and 1491
- Prime factors of 1491: 3, 7, 71
Conclusion:
- 1491 is the composite number which has factors 1, 3, 7, 21, 71, 213, 497 and 1491.
- And hence, 1491 is not the prime number.
Multiple Choice Questions:
1) 1491 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 1491 are
a) 1
b) 3, 7, 71
c) 1, 21, 213, 497 and 1491
d) 1, 3, 7, 21, 71, 213, 497 and 1491
Ans: b) 1, 21, 213, 497 and 1491
3) 1491 is the odd composite number because
a) It has factors 1, 3, 7, 21, 71, 213, 497 and 1491
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all