It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 20 723 is not a prime number.
For example, 20 723 can be divided by 17: 20 723 / 17 = 1 219.
For 20 723 to be a prime number, it would have been required that 20 723 has only two divisors, i.e., itself and 1.
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20 723 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 20 723 is about 143.955.
Thus, the square root of 20 723 is not an integer, and therefore 20 723 is not a square number.
The square of a number (here 20 723) is the result of the product of this number (20 723) by itself (i.e., 20 723 × 20 723); the square of 20 723 is sometimes called "raising 20 723 to the power 2", or "20 723 squared".
The square of 20 723 is 429 442 729 because 20 723 × 20 723 = 20 7232 = 429 442 729.
As a consequence, 20 723 is the square root of 429 442 729.
The multiples of 20 723 are all integers evenly divisible by 20 723, that is all numbers such that the remainder of the division by 20 723 is zero. There are infinitely many multiples of 20 723. The smallest multiples of 20 723 are: