Number having three or more factors are called
Answers
Odd numbers of factors
If you find all of the factors of a non-square, you can "pair off" the factors. For instance, the factors of 12 are 1, 2, 3, 4, 6, and 12. You can split those six factors into three pairs, each of which multiplies to 12:
1 and 12
2 and 6
3 and 4
However, if you try the same thing with a square, you end up with a duplicate. The factors of 16 are 1, 2, 4, 8, and 16, some of which pair off:
1 and 16
2 and 8
4 and ... itself
Any time you are finding the factors of a square, the final step will involve the square root, like 4 above. That square root only counts once--4 is only one factor, not two. So 16, like 9 and 49, has an odd number of factors.
We can generalize this and state the rule in a couple of different ways. First, if an integer has an odd number of factors, it is a perfect square. Second, if a number is a perfect square, it has an odd number of factors.
Most of the time this comes up on GMAT questions, you'll encounter the concept of integers with three factors. However, it's a small step from there to understanding the more universal concept, which is likely to appear on much more challenging test items.
Answer:
The numbers having three or more factors are called Composite numbers.
Step-by-step explanation:
- Composite Number:
A number that has more than 2 or more factors is called a composite number.
- Types of Composite numbers:
There are two types of Composite numbers.
(i) Even composite numbers
(ii) Odd composite numbers
- Even composite numbers :
Some of the even composite numbers which have more number of factors are
4, 6, 8, 10, 12, 14, 16, 18................etc
- Odd composite numbers:
Some of the odd composite numbers which have more number of factors are
9, 15, 21, 25, 33, ....................
- Factor: A factor is a number that exactly divides the other number with zero remainder.
Example: Factors of 12 are 2, 3, 4, 6, 12
Know more about Factors:
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