Primes: prime number refers to a natural number greater than 1 , in addition to 1 and which itself has no He factor natural number.
Composite number: Number engagement means can be a natural number, in addition to a whole and excluding itself, but also by other numbers (excluding 0) of an integer number. Contrast is a prime number, but neither one nor the number of prime numbers together. 4 Number is the smallest.
Factor: factor refers to the integer a is divided by integer b (b ≠ 0) business happens to be an integer without a remainder, we say that b is a factor.
Odd: 2 means not divisible, is expressed in mathematical form as: 2k + 1, can be divided into odd-odd positive and negative odd number.
Even: it is able to be an integer divisible by 2. Also known as positive even-numbered. 2 is a multiple of a number, which is an even number, can be expressed as 2n, 0 is an even number.
Coprime: also called relatively prime , it is a common divisor of two integers only one, called co-prime integers. Only two natural number divisors 1, called coprime natural numbers, which is a special case of the former.
1 and 1 and all integers coprime, and they are the only prime integer with 0.
Divisor: also known as "common factor." It is a number that can be simultaneously both integer divisible integers. If an integer number about the same time a few integers, the integer is called their "common divisor";
Natural number: refers to the number of things for the measurement indicates the number or order of things. That 0,1,2, with a digital 3 , 4 ...... number represents.
About 0: " integer including 0. 0, but neither is a positive integer, nor a negative integer, it is between the positive and negative integers.
Rational: it is an integer (positive integer, 0, negative integer) and fractions collectively, is the set of integers and fractions.