Is 1251 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 1251 is composite or not first we have to find its factors.
Contents
Factors of 1251:
- If we have taken numbers from 1, 2, 3…for checking factors of 1251, we found that 1251 has factors 1, 3, 9, 139, 417 and 1251. Hence, we must say that 1251 is a composite number.
- Thus, 1251 is the composite number.
- If we multiply 1251 by 1, 2, 3 then we get the multiples of 1251 which are 1251, 2502 and so on.
1251 is a Composite number or Prime number
About the number 1251:
- 1251 has more than two factors which are 1, 3, 9, 139, 417 and 1251 and hence it is the composite number.
- 1251 is the odd composite number and it is not the perfect square also.
- If we divide 1251 by 1, 3, 9, 139, 417 and 1251 then we get remainder as zero. Hence, 1, 3, 9, 139, 417 and 1251 are the factors of 1251
Note:
- 1251 is not the perfect square.
- Factors of 1251: 1, 3, 9, 139, 417 and 1251
- Prime factors of 1251: 3, 139
Conclusion:
- 1251 is the composite number which has factors 1, 3, 9, 139, 417 and 1251.
- And hence, 1251 is not the prime number.
Multiple Choice Questions:
1) 1251 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 1251 are
a) 1
b) 3, 139
c) 1, 9, 417 and 1251
d) 1, 3, 9, 139, 417 and 1251
Ans: b) 1, 9, 417 and 1251
3) 1251 is the odd composite number because
a) It has factors 1, 3, 9, 139, 417 and 1251
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all