Is 620 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 620 is composite or not first we have to find its factors.
Contents
Factors of 620:
- If we have taken numbers from 1, 2, 3…for checking factors of 620, we found that 620 has factors 1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 310 and 620. Hence, we must say that 620 is a composite number.
- Thus, 620 is the composite umber.
- If we multiply 620 by 1, 2, 3 then we get the multiples of 620 which are 620, 1240 and so on.
About the number 620:
- 620 has more than two factors which are 1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 310 and 620 and hence it is the composite number.
- 620 is the even composite number and it is not the perfect square also.
- If we divide 620 by 1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 310 and 620 then we get remainder as zero. Hence,1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 310 and 620 are the factors of 620.
Note:
- 620 is not the perfect square.
- Factors of 620: 1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 310 and 620
- Prime factors of 620: 2, 5, 31
Conclusion:
- 620 is the composite number which has factors 1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 310 and 620
- And hence, 620 is not the prime number.
Multiple Choice Questions:
1) 620 is a
a) Prime number
b) odd number
c) Composite number
d) Both b and c
Ans: c) composite number
2) The non-prime factors of a composite number 620 are
a) 1
b) 2, 5, 31
c) 1, 4, 10, 20, 62, 124, 155, 310 and620
d) 1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 310 and 620
Ans: c) 1, 4,10, 20, 62, 124, 155, 310 and 620
3) 620 is the composite number because
a) It has two factors
b) More than two factors
c) Divisible by 2
d) Both b and c
Ans: b) more than two factors