It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 23 657 is not a prime number.
For example, 23 657 can be divided by 41: 23 657 / 41 = 577.
For 23 657 to be a prime number, it would have been required that 23 657 has only two divisors, i.e., itself and 1.
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23 657 is an odd number, because it is not evenly divisible by 2.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 23 657 is about 153.808.
Thus, the square root of 23 657 is not an integer, and therefore 23 657 is not a square number.
The square of a number (here 23 657) is the result of the product of this number (23 657) by itself (i.e., 23 657 × 23 657); the square of 23 657 is sometimes called "raising 23 657 to the power 2", or "23 657 squared".
The square of 23 657 is 559 653 649 because 23 657 × 23 657 = 23 6572 = 559 653 649.
As a consequence, 23 657 is the square root of 559 653 649.
The multiples of 23 657 are all integers evenly divisible by 23 657, that is all numbers such that the remainder of the division by 23 657 is zero. There are infinitely many multiples of 23 657. The smallest multiples of 23 657 are: