En matemática, un número par es un número entero que se puede escribir de la forma: 2k (es decir, divisible de manera entera entre 2), donde k es un entero (los números pares son los múltiplos del número 2). Los números enteros que no son pares, se llaman números impares (o menores), y se pueden escribir como 2k+1. Los números pares son: y los impares: La paridad de un número entero se refiere a su atributo de ser par o impar. Comparativamente, dos números son «de la misma paridad» si al dividirlos entre 2, el resto es el mismo, por ejemplo: "2" y "4", o "3" y "7"; son «de la misma paridad». Por el contrario los números "23" y "44" son «de distinta paridad».

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Parity is a mathematical term that describes the property of an integer's inclusion in one of two categories: even or odd. An integer is even if it is 'evenly divisible' by two (the old-fashioned term "evenly divisible" is now almost always shortened to "divisible") and odd if it is not even. For example, 6 is even because there is no remainder when dividing it by 2. By contrast, 3, 5, 7, 21 leave a remainder of 1 when divided by 2. Examples of even numbers include −4, 0, 8, and 1738. In particular, zero is an even number. Some examples of odd numbers are −5, 3, 9, and 73. Parity does not apply to non-integer numbers. A formal definition of an even number is that it is an integer of the form n = 2k, where k is an integer; it can then be shown that an odd number is an integer of the form n = 2k + 1. This classification applies only to integers, i.e., non-integers like 1/2, 4.201, or infinity are neither even nor odd. The sets of even and odd numbers can be defined as following: \n* Even \n* Odd A number (i.e., integer) expressed in the decimal numeral system is even or odd according to whether its last digit is even or odd.That is, if the last digit is 1, 3, 5, 7, or 9, then it is odd; otherwise it is even. The same idea will work using any even base.In particular, a number expressed in the binary numeral system is odd if its last digit is 1 and even if its last digit is 0.In an odd base, the number is even according to the sum of its digits – it is even if and only if the sum of its digits is even.

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