It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 23 842 is not a prime number.
For example, 23 842 can be divided by 2: 23 842 / 2 = 11 921.
For 23 842 to be a prime number, it would have been required that 23 842 has only two divisors, i.e., itself and 1.
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23 842 is an even number, because it is evenly divisible by 2: 23 842 / 2 = 11 921.
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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 23 842 is about 154.409.
Thus, the square root of 23 842 is not an integer, and therefore 23 842 is not a square number.
The square of a number (here 23 842) is the result of the product of this number (23 842) by itself (i.e., 23 842 × 23 842); the square of 23 842 is sometimes called "raising 23 842 to the power 2", or "23 842 squared".
The square of 23 842 is 568 440 964 because 23 842 × 23 842 = 23 8422 = 568 440 964.
As a consequence, 23 842 is the square root of 568 440 964.
The multiples of 23 842 are all integers evenly divisible by 23 842, that is all numbers such that the remainder of the division by 23 842 is zero. There are infinitely many multiples of 23 842. The smallest multiples of 23 842 are: