Is 1521 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 1521 is composite or not first we have to find its factors.
Contents
Factors of 1521:
- If we have taken numbers from 1, 2, 3…for checking factors of 1521, we found that 1521 has factors 1, 3, 9, 13, 39, 117, 169, 507 and 1521. Hence, we must say that 1521 is a composite number.
- Thus, 1521 is the composite number.
- If we multiply 1521 by 1, 2, 3 then we get the multiples of 1521 which are 1521, 3042 and so on.
1521 is a Composite number or Prime number
About the number 1521:
- 1521 has more than two factors which are 1, 3, 9, 13, 39, 117, 169, 507 and 1521 and hence it is the composite number.
- 1521 is the odd composite number and it is the perfect square also.
- If we divide 1521 by 1, 3, 9, 13, 39, 117, 169, 507 and 1521 then we get remainder as zero. Hence, 1, 3, 9, 13, 39, 117, 169, 507 and 1521 are the factors of 1521
Note:
- 1521 is the perfect square.
- Factors of 1521: 1, 3, 9, 13, 39, 117, 169, 507 and 1521
- Prime factors of 1521: 3, 13
Conclusion:
- 1521 is the composite number which has factors 1, 3, 9, 13, 39, 117, 169, 507 and 1521.
- And hence, 1521 is not the prime number.
Multiple Choice Questions:
1) 1521 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 1521 are
a) 1
b) 3, 13
c) 1, 9, 39, 117, 169, 507 and 1521
d) 1, 3, 9, 13, 39, 117, 169, 507 and 1521
Ans: b) 1, 9, 39, 117, 169, 507 and 1521
3) 1521 is the odd composite number because
a) It has factors 1, 3, 9, 13, 39, 117, 169, 507 and 1521
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all