Is 1445 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 1445 is composite or not first we have to find its factors.
Contents
Factors of 1445:
- If we have taken numbers from 1, 2, 3…for checking factors of 1445, we found that 1445 has factors 1, 5, 17, 85, 289 and 1445. Hence, we must say that 1445 is a composite number.
- Thus, 1445 is the composite number.
- If we multiply 1445 by 1, 2, 3 then we get the multiples of 1445 which are 1445, 2890 and so on.
1445 is a Composite number or Prime number
About the number 1445:
- 1445 has more than two factors which are 1, 5, 17, 85, 289 and 1445 and hence it is the composite number.
- 1445 is the odd composite number and it is not the perfect square also.
- If we divide 1445 by 1, 5, 17, 85, 289 and 1445 then we get remainder as zero. Hence, 1, 5, 17, 85, 289 and 1445 are the factors of 1445
Note:
- 1445 is not the perfect square.
- Factors of 1445: 1, 5, 17, 85, 289 and 1445
- Prime factors of 1445: 5, 17
Conclusion:
- 1445 is the composite number which has factors 1, 5, 17, 85, 289 and 1445.
- And hence, 1445 is not the prime number.
Multiple Choice Questions:
1) 1445 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 1445 are
a) 1
b) 5, 17
c) 1, 85, 289 and 1445
d) 1, 5, 17, 85, 289 and 1445
Ans: b) 1, 85, 289 and 1445
3) 1445 is the odd composite number because
a) It has factors 1, 5, 17, 85, 289 and 1445
b) It has more than two factors
c) It is not divisible by 2
d) all
Ans: d) all