Is 1245 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 1245 is composite or not first we have to find its factors.
Contents
Factors of 1245:
- If we have taken numbers from 1, 2, 3…for checking factors of 1245, we found that 1245 has factors 1, 3, 5, 15, 83, 249, 415 and 1245. Hence, we must say that 1245 is a composite number.
- Thus, 1245 is the composite number.
- If we multiply 1245 by 1, 2, 3 then we get the multiples of 1245 which are 1245, 2490 and so on.
1245 is a Composite number or Prime number
About the number 1245:
- 1245 has more than two factors which are 1, 3, 5, 15, 83, 249, 415 and 1245 and hence it is the composite number.
- 1245 is the odd composite number and it is not the perfect square also.
- If we divide 1245 by 1, 3, 5, 15, 83, 249, 415 and 1245 then we get remainder as zero. Hence, 1, 3, 5, 15, 83, 249, 415 and 1245 are the factors of 1245
Note:
- 1245 is not the perfect square.
- Factors of 1245: 1, 3, 5, 15, 83, 249, 415 and 1245
- Prime factors of 1245: 3, 5, 83
Conclusion:
- 1245 is the composite number which has factors 1, 3, 5, 15, 83, 249, 415 and 1245.
- And hence, 1245 is not the prime number.
Multiple Choice Questions:
1) 1245 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 1245 are
a) 1
b) 3, 5, 83
c) 1, 15, 249, 415 and 1245
d) 1, 3, 5, 15, 83, 249, 415 and 1245
Ans: b) 1, 15, 249, 415 and 1245
3) 1245 is the odd composite number because
a) It has factors 1, 3, 5, 15, 83, 249, 415 and 1245
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all