Is 1421 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 1421 is composite or not first we have to find its factors.
Contents
Factors of 1421:
- If we have taken numbers from 1, 2, 3…for checking factors of 1421, we found that 1421 has factors 1, 7, 29, 49, 203 and 1421. Hence, we must say that 1421 is a composite number.
- Thus, 1421 is the composite number.
- If we multiply 1421 by 1, 2, 3 then we get the multiples of 1421 which are 1421, 2842 and so on.
1421 is a Composite number or Prime number
About the number 1421:
- 1421 has more than two factors which are 1, 7, 29, 49, 203 and 1421 and hence it is the composite number.
- 1421 is the odd composite number and it is not the perfect square also.
- If we divide 1421 by 1, 7, 29, 49, 203 and 1421 then we get remainder as zero. Hence, 1, 7, 29, 49, 203 and 1421 are the factors of 1421
Note:
- 1421 is not the perfect square.
- Factors of 1421: 1, 7, 29, 49, 203 and 1421
- Prime factors of 1421: 7, 29
Conclusion:
- 1421 is the composite number which has factors 1, 7, 29, 49, 203 and 1421.
- And hence, 1421 is not the prime number.
Multiple Choice Questions:
1) 1421 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 1421 are
a) 1
b) 7, 29
c) 1, 49, 203 and 1421
d) 1, 7, 29, 49, 203 and 1421
Ans: b) 1, 49, 203 and 1421
3) 1421 is the odd composite number because
a) It has factors 1, 7, 29, 49, 203 and 1421
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all