It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 494 423 is not a prime number.
For example, 494 423 can be divided by 139: 494 423 / 139 = 3 557.
For 494 423 to be a prime number, it would have been required that 494 423 has only two divisors, i.e., itself and 1.
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494 423 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 494 423 is about 703.152.
Thus, the square root of 494 423 is not an integer, and therefore 494 423 is not a square number.
The square of a number (here 494 423) is the result of the product of this number (494 423) by itself (i.e., 494 423 × 494 423); the square of 494 423 is sometimes called "raising 494 423 to the power 2", or "494 423 squared".
The square of 494 423 is 244 454 102 929 because 494 423 × 494 423 = 494 4232 = 244 454 102 929.
As a consequence, 494 423 is the square root of 244 454 102 929.
The multiples of 494 423 are all integers evenly divisible by 494 423, that is all numbers such that the remainder of the division by 494 423 is zero. There are infinitely many multiples of 494 423. The smallest multiples of 494 423 are: