Is 1240 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 1240 is composite or not first we have to find its factors.
Contents
Factors of 1240:
- If we have taken numbers from 1, 2, 3…for checking factors of 1240, we found that 1240 has factors 1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620 and 1240. Hence, we must say that 1240 is a composite number.
- Thus, 1240 is the composite number.
- If we multiply 1240 by 1, 2, 3 then we get the multiples of 1240 which are 1240, 2480 and so on.
About the number 1240:
- 1240 has more than two factors which are 1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620 and 1240 and hence it is the composite number.
- 1240 is the even composite number and it is not the perfect square also.
- If we divide 1240 by 1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620 and 1240 then we get remainder as zero. Hence, 1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620 and 1240 are the factors of 1240.
Note:
- 1240 is not the perfect square.
- Factors of 1240: 1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620 and 1240
- Prime factors of 1240: 2, 5, 31
Conclusion:
- 1240 is the composite number which has factors 1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620 and 1240
- And hence, 1240 is not the prime number.
Multiple Choice Questions:
1) 1240 is a
a) Even number
b) Not a perfect square number
c) Composite number
d) all
Ans: d) all
2) The composite factors of a composite number 1240 are
a) 4, 8, 10, 20, 40, 62, 124, 155, 248, 310, 620 and 1240
b) 2, 5, 31
c) 1, 4, 8, 10, 20, 40, 62, 124, 155, 248, 310, 620 and 1240
d) 1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620 and 1240
Ans: a) 4, 8, 10, 20, 40, 62, 124, 155, 248, 310, 620 and 1240
3) 1240 is composite number because
a) It has factors 1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620 and 1240
b) It has more than two factors
c) Divisible by 2
d) Both a and b
Ans: d) both a and b