It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 240 423 is not a prime number.
For example, 240 423 can be divided by 3: 240 423 / 3 = 80 141.
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For 240 423 to be a prime number, it would have been required that 240 423 has only two divisors, i.e., itself and 1.
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240 423 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 240 423 is about 490.329.
Thus, the square root of 240 423 is not an integer, and therefore 240 423 is not a square number.
The square of a number (here 240 423) is the result of the product of this number (240 423) by itself (i.e., 240 423 × 240 423); the square of 240 423 is sometimes called "raising 240 423 to the power 2", or "240 423 squared".
The square of 240 423 is 57 803 218 929 because 240 423 × 240 423 = 240 4232 = 57 803 218 929.
As a consequence, 240 423 is the square root of 57 803 218 929.
The multiples of 240 423 are all integers evenly divisible by 240 423, that is all numbers such that the remainder of the division by 240 423 is zero. There are infinitely many multiples of 240 423. The smallest multiples of 240 423 are: