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One is a natural number after zero and before two. It represents a single item. A human typically has one head, nose, mouth, and navel. It is also a pronoun, as in, "one says...", "one does...". It is used in place of "a person says..." or "an individual does...". In mathematics, one is also the only number with this special fact: Any number multiplied by 1 equals that number. Then, the number 1 divides any number but it is not divided by any. The number 1 divides any number to give that same number but it cannot be divided by any other number to give one as the answer. Let n be any number. Then n/1 = n but 1/n is never 1.(When n is not 1) Example: 7/1 = 7 but 1/7 is not 1 but 0.142857... Any number divided by itself always gives 1 as the answer. n/n = 1. (When n is not 0) Example: 7/7 = 1. (wikipedia)

Two is a number, numeral, and glyph. It is the natural number after One and before Three. Two has many properties in mathematics. For example: 1 + 1 = 2. An integer is called even if it can be divided by 2. For integers written in a numeral system based on an even number, such as decimal and hexadecimal, it can be easily tested if it is a multiple of 2 by merely looking at the one's place digit. If it is even, then the whole number is even. In particular, when written in the decimal system, all multiples of 2 will end in 0, 2, 4, 6, or 8. (wikipedia)

The number three is one more than two and one less than four. Three is an important number for many cultures (groups of people living together). Sometimes people think of three as a special number. It is also a prime number. (wikipedia)

The number four, is a number and a numeral. It comes after the number three, but before the number five. In math, the number four is an even number and the smallest composite number. Four is also the second square number after one. (wikipedia)

The number five is a number that comes after four, but before the number six. Five is the third prime number, after two and three, and before seven. The number five is also an odd number. Most people have five fingers on each hand and five toes on each foot. (wikipedia)

The number six is a natural number that comes after the number five, but before the number seven. Six is also the first perfect number which means that the sum of its factors (1, 2 and 3) are equal to the number itself (6). The next perfect number is 28. In math, the number six is an even number. (wikipedia)