Is 345 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 345 is composite or not first we have to find its factors.
Contents
Factors of 345:
- If we have taken numbers from 1, 2, 3…for checking factors of 345, we found that 345 has factors 1, 3, 5, 15, 23, 69, 115 and 345. Hence, we must say that 345 is a composite number.
- Thus, 345 is the composite number.
- If we multiply 345 by 1, 2, 3 then we get the multiples of 345 which are 345, 690 and so on.
345 is a Composite number or Prime number
About the number 345:
- 345 has more than two factors which are 1, 3, 5, 15, 23, 69, 115 and 345 and hence it is the composite number.
- 345 is the odd composite number and it is not the perfect square also.
- If we divide 345 by 1, 3, 5, 15, 23, 69, 115 and 345 then we get remainder as zero. Hence, 1, 3, 5, 15, 23, 69, 115 and 345 are the factors of 345.
Note:
- 345 is not the perfect square.
- Factors of 345: 1, 3, 5, 15, 23, 69, 115 and 345
- Prime factors of 345: 3, 5, 23
Conclusion:
- 345 is the composite number which has factors 1, 3, 5, 15, 23, 69, 115 and 345.
- And hence, 345 is not the prime number.
Multiple Choice Questions:
1) 345 is a
a) odd number
b) Prime number
c) Composite number
d) Both a and c
Ans: d) both a and c
2) The prime factors of a composite number 345 are
a) 1
b) 3, 5, 23
c) 1, 15, 69, 115 and 345
d) 1, 3, 5, 15, 23, 69, 115 and 345
Ans: b) 3, 5, 23
3) 345 is the odd composite number because
a) It has factors 1, 3, 5, 15, 23, 69, 115 and 345
b) It is divisible by 2
c) It is not divisible by 2
d) Both a and c
Ans: d) both a and c