It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 40 023 is not a prime number.
For example, 40 023 can be divided by 3: 40 023 / 3 = 13 341.
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For 40 023 to be a prime number, it would have been required that 40 023 has only two divisors, i.e., itself and 1.
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40 023 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 40 023 is about 200.057.
Thus, the square root of 40 023 is not an integer, and therefore 40 023 is not a square number.
The square of a number (here 40 023) is the result of the product of this number (40 023) by itself (i.e., 40 023 × 40 023); the square of 40 023 is sometimes called "raising 40 023 to the power 2", or "40 023 squared".
The square of 40 023 is 1 601 840 529 because 40 023 × 40 023 = 40 0232 = 1 601 840 529.
As a consequence, 40 023 is the square root of 1 601 840 529.
The multiples of 40 023 are all integers evenly divisible by 40 023, that is all numbers such that the remainder of the division by 40 023 is zero. There are infinitely many multiples of 40 023. The smallest multiples of 40 023 are: