Is 145 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 145 is composite or not first we have to find its factors.
Contents
Factors of 145:
- If we have taken numbers from 1, 2, 3…for checking factors of 145, we found that 145 has factors 1, 5, 29 and 145. Hence, we must say that 145 is a composite number.
- Thus, 145 is the composite number.
- If we multiply 145 by 1, 2, 3 then we get the multiples of 145 which are 145, 290, and so on.
About the number 145:
- 145 has more than two factors which are 1, 5, 29 and 145 and hence it is the composite number.
- 145 is the odd composite number and it is not the perfect square also.
- If we divide 145 by 1, 5, 29 and 145 then we get remainder as zero. Hence, 1, 5, 29 and 145 are the factors of 145.
Note:
- 145 is not the perfect square.
- Factors of 145: 1, 5, 29 and 145
- Prime factors of 145: 5, 29
Conclusion:
- 145 is the composite number which has factors 1, 5, 29 and 145.
- And hence, 145 is not the prime number.
Multiple Choice Questions:
1) 145 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 145 are
a) 1
b) 5, 29
c) Both a and b
d) 1451
Ans: b) 5, 29
3) 1 is the not prime factor of 145 because
a) It is the prime number
b) 1 is neither prime nor composite number
c) Both a and b
d) Given statement is false
Ans: b) 1 is neither prime nor composite number