It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 490 838 is not a prime number.
For example, 490 838 can be divided by 2: 490 838 / 2 = 245 419.
For 490 838 to be a prime number, it would have been required that 490 838 has only two divisors, i.e., itself and 1.
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490 838 is an even number, because it is evenly divisible by 2: 490 838 / 2 = 245 419.
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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 490 838 is about 700.598.
Thus, the square root of 490 838 is not an integer, and therefore 490 838 is not a square number.
The square of a number (here 490 838) is the result of the product of this number (490 838) by itself (i.e., 490 838 × 490 838); the square of 490 838 is sometimes called "raising 490 838 to the power 2", or "490 838 squared".
The square of 490 838 is 240 921 942 244 because 490 838 × 490 838 = 490 8382 = 240 921 942 244.
As a consequence, 490 838 is the square root of 240 921 942 244.
The multiples of 490 838 are all integers evenly divisible by 490 838, that is all numbers such that the remainder of the division by 490 838 is zero. There are infinitely many multiples of 490 838. The smallest multiples of 490 838 are: