Is 1290 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 1290 is composite or not first we have to find its factors.
Contents
Factors of 1290:
- If we have taken numbers from 1, 2, 3…for checking factors of 1290, we found that 1290 has factors 1, 2, 3, 5, 6, 10, 15, 30, 43, 86, 129, 215, 258, 430, 645 and 1290. Hence, we must say that 1290 is a composite number.
- Thus, 1290 is the composite number.
- If we multiply 1290 by 1, 2, 3 then we get the multiples of 1290 which are 1290, 2580 and so on.
About the number 1290:
- 1290 has more than two factors which are 1, 2, 3, 5, 6, 10, 15, 30, 43, 86, 129, 215, 258, 430, 645 and 1290 and hence it is the composite number.
- 1290 is the even composite number and it is not the perfect square also.
- If we divide 1290 by 1, 2, 3, 5, 6, 10, 15, 30, 43, 86, 129, 215, 258, 430, 645 and 1290 then we get remainder as zero. Hence, 1, 2, 3, 5, 6, 10, 15, 30, 43, 86, 129, 215, 258, 430, 645 and 1290 are the factors of 1290.
Note:
- 1290 is not the perfect square.
- Factors of 1290: 1, 2, 3, 5, 6, 10, 15, 30, 43, 86, 129, 215, 258, 430, 645 and 1290
- Prime factors of 1290: 2, 3, 5, 43
Conclusion:
- 1290 is the composite number which has factors 1, 2, 3, 5, 6, 10, 15, 30, 43, 86, 129, 215, 258, 430, 645 and 1290
- And hence, 1290 is not the prime number.
Multiple Choice Questions:
1) 1290 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 1290 are
a) 6, 10, 15, 30, 86, 129, 215, 258, 430, 645 and 1290
b) 2, 3, 5, 43
c) 1, 6, 10, 15, 30, 86, 129, 215, 258, 430, 645 and 1290
d) 1, 2, 3, 5, 6, 10, 15, 30, 43, 86, 129, 215, 258, 430, 645 and 1290
Ans: a) 6, 10, 15, 30, 86, 129, 215, 258, 430, 645 and 1290
3) 1290 is composite number because
a) It has factors 1, 2, 3, 5, 6, 10, 15, 30, 43, 86, 129, 215, 258, 430, 645 and 1290
b) It has more than two factors
c) Divisible by 2
d) Both a and b
Ans: d) both a and b