Composite Numbers

Prime numbers only 1 and itself can go in to it composite 1 itself and other factors therefore 260 is a composite number

All composite numbers can be expressed as unique products of prime numbers. This is accomplished by dividing the original number and its factors by prime numbers until all the factors are prime. A factor tree can help you visualize this.

Example: 210

210 Divide by two.

105,2 Divide by three.

35,3,2 Divide by five.

7,5,3,2 Stop. All the factors are prime.

2 x 3 x 5 x 7 = 210

That's the prime factorization of 210.

composite has more than 2 factors and prime has 2 factors

As an even number greater than 2, 1874 is divisible by 2 and therefore composite. Its positive integer factors are:

1, 2, 937, 1874

1 is not considered to be a prime or composite number because it has only one factor which is itself.

It is a composite number.

68 is a Composite Number.

200 is composite.

97 is a prime and so has no proper factors.

It is a prime.

The composite numbers you asked for: 100, 102, 104, 105, 106, 108, 110, 111, 112, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 128, 129, 130, 132, 133, 134, 135, 136, 138, 140, 141, 142, 143, 144, 145, 146, 147, 148, 150, 152, 153, 154, 155, 156, 158, 159, 160, 161, 162, 164, 165, 166, 168, 169, 170, 171, 172, 174, 175, 176, 177, 178, 180, 182, 183, 184, 185, 186, 187, 188, 189, 190, 192, 194, 195, 196, 198, 200.

Yes

20 and 30 are.

23 is not.

1 and 0.

1 is neither a prime, nor a composite number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.

They are: 4 6 8 9 10 12 14 15 16 18.

15, 87, 145, 435

You will find an interesting and accessible history of the notion of infinity at http://www.mathacademy.com/pr/minitext/infinity/ In the course of discussing the history, the article naturally discusses some of the varying concepts of infinity and who proposed them; and at the end of the article there is a "Link Library" button that will bring you to other sites about infinity.

720405 is a composite number - since it has a digit 5 at the end, you know that it is divisible by 5. Its positive integer factors are:

1, 3, 5, 7, 9, 15, 21, 35, 45, 63, 105, 315, 2287, 6861, 11435, 16009, 20583, 34305, 48027, 80045, 102915, 144081, 240135, 720405

It is composite.

You describe a composite number by saying... A composite number is a number that has more factors than itself and 1.

111*3

It is composite because it has more than 2 factors

40 is composite.