Composite Numbers

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89.

Yes except 2 which is a prime number

They are: 4 6 8 9 10 12 14 15 16 and 18 because each of them has more than 2 factors

It is composite.

47 is prime. A number that is prime has only whole factors one and itself. 47 can not be divided evenly without a remainder or decimal.

Add them up.

40, 42, 44, 45, 46, 48, 49, 50

799 is a Composite Number.

However by looking at a number it is not easy to figure out whether a number is prime or composite.

Every even number excpet 2 is a composite number so, any number having last digit as 0, 2, 4, 6 or 8 is a composite number. This is one of the ways to figure out.

However for the odd numbers it becomes diificult to figure out.

For a quicker analysis there are divisiblity rules. These are shorthand ways to find whether a number is divisble by another without performing actual division.

Please take a look at the related links(below) for more information.

The prime factors of 11 are 11 x 11.

Composite.

The number 63 is not a prime number as it can be divided by 3 to make 21 as well as it self and one

it is a composite number

Because it has more than 2 factors

Composite because it has more than two factors.

It is: 20.5

Yes because it has more than 2 factors

It is a prime number because it has only 2 factors which are itself and one

It is composite.

97 is prime.

Composite

The prime factorization of 27 is 3 x 3 x 3.

398?

NO.

42, 44, 45, 46, 48, 49.

3 x 5 x 5 = 75