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**Yes, number 57 is a composite number.**- Fifty-seven is a composite number, because it has more divisors than 1 and itself.

- No the number 57 is not a prime number.

- The prime factors of number 57 are: 3, 19
- Equcation for number fifty-seven factorization is: 3 * 19

- So, if n > 0 is an integer and there are integers 1 < a, b < n such that n = a * b, then n is composite. By definition, every integer greater than one is either a prime number or a composite number. The number one is a unit, it is neither prime nor composite. For example, the integer 14 is a composite number because it can be factored as 2 * 7. Likewise, the integers 2 and 3 are not composite numbers because each of them can only be divided by one and itself.
- Every composite number can be written as the product of two or more (not necessarily distinct) primes, for example, the composite number 299 can be written as 13 * 23, and that the composite number 360 can be written as 23 * 32 * 5; furthermore, this representation is unique up to the order of the factors. This is called the fundamental theorem of arithmetic.

- Is 57 A Prime Number?
- Prime Factorization Of 57
- Prime Factors Of 57
- Is 57 An Even Number?
- Is 57 An Odd Number?
- Square Root Of 57?

**About Number 5.**Integers with a last digit as a zero or a five in the decimal system are divisible by five. Five is a prime number. All odd multiples of five border again with the five (all even with zero). The fifth number of the Fibonacci sequence is a five. Five is also the smallest prime number that is the sum of all other primes which are smaller than themselves. The Five is a Fermat prime: 5 = 2 ^ {2 ^ 1} +1 and the smallest Wilson prime. Number five is a bell number (sequence A000110 in OEIS). There are exactly five platonic bodies. There are exactly five tetrominoes.**About Number 7.**Seven is a prime number. It is the lowest natural number that cannot be represented as the sum of the squares of three integers. The corresponding cyclic number is 142857. You can use this feature to calculate the result of the division of natural numbers by 7 without a calculator quickly. A seven-sided shape is a heptagon. One rule for divisibility by 7 leads to a simple algorithm to test the rest loose divisibility of a natural number by 7: Take away the last digit, double it and subtract them from the rest of the digits. If the difference is negative, then you're leaving the minus sign. If the result has more than one digit, so you repeat steps 1 through fourth. Eventually results are 7 or 0, then the number is divisible by 7 and not otherwise.

A composite number is a positive integer that has at least one positive divisor other than one or the number itself. In other words, a composite number is any integer greater than one that is not a prime number.

A composite number (or simply a composite) is a natural number, that can be found by multiplying prime numbers. For example, the number 9 can be found by multiplying 3 by 3, and the number 12. You get it by multiplying 3, 2 and 2. All natural numbers (greater than 1) can be put in one of the two classes. Either the number is prime. Or the number is not prime. It can be found by multiplying together other primes. The same prime number can be used several times, as in the example with 12 above. This is known as the fundamental theorem of arithmetic.

A composite number (or simply a composite) is a natural number, that can be found by multiplying prime numbers. For example, the number 9 can be found by multiplying 3 by 3, and the number 12. You get it by multiplying 3, 2 and 2. All natural numbers (greater than 1) can be put in one of the two classes. Either the number is prime. Or the number is not prime. It can be found by multiplying together other primes. The same prime number can be used several times, as in the example with 12 above. This is known as the fundamental theorem of arithmetic.