Prime number/Citable Version: Difference between revisions
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A '''prime number''' is a whole number (i.e, one having no fractional or decimal part) that cannot be evenly [[divisor|divided]] by any numbers but 1 and itself. The first few prime numbers are 2, 3, 5, 7, 11, 13, and so on. With the exception of 2, the first few numbers on this list are [[odd]] numbers, but not every odd number is prime. For example, <math>9 = 3\cdot3</math> and <math>15 = 3\cdot5</math>, so neither 9 nor 15 is prime. | A '''prime number''' is a whole number (i.e, one having no fractional or decimal part) that cannot be evenly [[divisor|divided]] by any numbers but <math>1</math> and itself. The first few prime numbers are <math>2</math>, <math>3</math>, <math>5</math>, <math>7</math>, <math>11</math>, <math>13</math>, and so on. With the exception of <math>2</math>, the first few numbers on this list are [[odd]] numbers, but not every odd number is prime. For example, <math>9 = 3\cdot3</math> and <math>15 = 3\cdot5</math>, so neither <math>9</math> nor <math>15</math> is prime. | ||
[[Category:Mathematics Workgroup]] | [[Category:Mathematics Workgroup]] | ||
[[category:CZ Live]] | [[category:CZ Live]] | ||
Revision as of 20:25, 4 April 2007
A prime number is a whole number (i.e, one having no fractional or decimal part) that cannot be evenly divided by any numbers but and itself. The first few prime numbers are , , , , , , and so on. With the exception of , the first few numbers on this list are odd numbers, but not every odd number is prime. For example, and , so neither nor is prime.
