Is 1818 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 1818 is composite or not first we have to find its factors.
Contents
Factors of 1818:
- If we have taken numbers from 1, 2, 3…for checking factors of 1818, we found that 1818 has factors 1, 2, 3, 6, 9, 18, 101, 202, 303, 606, 909 and 1818. Hence, we must say that 1818 is a composite number.
- Thus, 1818 is the composite number.
- If we multiply 1818 by 1, 2, 3 then we get the multiples of 1818 which are 1818, 3636 and so on.
About the number 1818:
- 1818 has more than two factors which are 1, 2, 3, 6, 9, 18, 101, 202, 303, 606, 909 and 1818 and hence it is the composite number.
- 1818 is the even composite number and it is not the perfect square also.
- If we divide 1818 by, 1, 2, 3, 6, 9, 18, 101, 202, 303, 606, 909 and 1818 then we get remainder as zero. Hence, 1, 2, 3, 6, 9, 18, 101, 202, 303, 606, 909 and 1818 are the factors of 1818.
Note:
- 1818 is not the perfect square.
- Factors of 1818: 1, 2, 3, 6, 9, 18, 101, 202, 303, 606, 909 and 1818
- Prime factors of 1818: 2, 3, 101
Conclusion:
- 1818 is the composite number which has factors 1, 2, 3, 6, 9, 18, 101, 202, 303, 606, 909 and 1818
- And hence, 1818 is not the prime number.
Multiple Choice Questions:
1) 1818 is a
a) Prime number
b) Odd number
c) Composite number
d) Both a and c
Ans: c) composite number
2) The non-prime factors of a composite number 1818 are
a) 1818
b) 2, 3, 101
c) 1, 6, 9, 18, 202, 303, 606, 909 and 1818
d) 1, 2, 3, 6, 9, 18, 101, 202, 303, 606, 909 and 1818
Ans: c) 1, 6, 9, 18, 202, 303, 606, 909 and 1818
3) 1818 is composite number because
a) It has factors1, 2, 3, 6, 9, 18, 101, 202, 303, 606, 909 and 1818
b) It has only two factors
c) Divisible by 2
d) Both a and c
Ans: a) it has factors 1, 2, 3, 6, 9, 18, 101, 202, 303, 606, 909 and 1818