Is 2445 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 2445 is composite or not first we have to find its factors.
Contents
Factors of 2445:
- If we have taken numbers from 1, 2, 3…for checking factors of 2445, we found that 2445 has factors 1, 3, 5, 15, 163, 489, 815 and 2445. Hence, we must say that 2445 is a composite number.
- Thus, 2445 is the composite number.
- If we multiply 2445 by 1, 2, 3 then we get the multiples of 2445 which are 2445, 4890 and so on.
2445 is a Composite number or Prime number
About the number 2445:
- 2445 has more than two factors which are 1, 3, 5, 15, 163, 489, 815 and 2445 and hence it is the composite number.
- 2445 is the odd composite number and it is not the perfect square also.
- If we divide 2445 by 1, 3, 5, 15, 163, 489, 815 and 2445 then we get remainder as zero. Hence 1, 3, 5, 15, 163, 489, 815 and 2445 are the factors of 2445
Note:
- 2445 is not the perfect square.
- Factors of 2445: 1, 3, 5, 15, 163, 489, 815 and 2445
- Prime factors of 2445: 3, 5, 163
Conclusion:
- 2445 is the composite number which has factors 1, 3, 5, 15, 163, 489, 815 and 2445.
- And hence, 2445 is not the prime number.
Multiple Choice Questions:
1) 2445 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 2445 are
a) 1
b) 3, 5, 163
c) 1 and 2445
d) 1, 3, 5, 15, 163, 489, 815 and 2445
Ans: b) 3, 5, 163
3) 2445 is the composite number because
a) It has factors 1, 3, 5, 15, 163, 489, 815 and 2445
b) It has more than two factors
c) It is not divisible by 2
d) Both a and b
Ans: d) both a and b