It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 490 423 is not a prime number.
For example, 490 423 can be divided by 401: 490 423 / 401 = 1 223.
For 490 423 to be a prime number, it would have been required that 490 423 has only two divisors, i.e., itself and 1.
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490 423 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 490 423 is about 700.302.
Thus, the square root of 490 423 is not an integer, and therefore 490 423 is not a square number.
The square of a number (here 490 423) is the result of the product of this number (490 423) by itself (i.e., 490 423 × 490 423); the square of 490 423 is sometimes called "raising 490 423 to the power 2", or "490 423 squared".
The square of 490 423 is 240 514 718 929 because 490 423 × 490 423 = 490 4232 = 240 514 718 929.
As a consequence, 490 423 is the square root of 240 514 718 929.
The multiples of 490 423 are all integers evenly divisible by 490 423, that is all numbers such that the remainder of the division by 490 423 is zero. There are infinitely many multiples of 490 423. The smallest multiples of 490 423 are: