It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 18 423 is not a prime number.
For example, 18 423 can be divided by 3: 18 423 / 3 = 6 141.
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For 18 423 to be a prime number, it would have been required that 18 423 has only two divisors, i.e., itself and 1.
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18 423 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 18 423 is about 135.731.
Thus, the square root of 18 423 is not an integer, and therefore 18 423 is not a square number.
The square of a number (here 18 423) is the result of the product of this number (18 423) by itself (i.e., 18 423 × 18 423); the square of 18 423 is sometimes called "raising 18 423 to the power 2", or "18 423 squared".
The square of 18 423 is 339 406 929 because 18 423 × 18 423 = 18 4232 = 339 406 929.
As a consequence, 18 423 is the square root of 339 406 929.
The multiples of 18 423 are all integers evenly divisible by 18 423, that is all numbers such that the remainder of the division by 18 423 is zero. There are infinitely many multiples of 18 423. The smallest multiples of 18 423 are: