It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 490 563 021 is not a prime number.
For example, 490 563 021 can be divided by 3: 490 563 021 / 3 = 163 521 007.
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For 490 563 021 to be a prime number, it would have been required that 490 563 021 has only two divisors, i.e., itself and 1.
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490 563 021 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 490 563 021 is about 22 148.657.
Thus, the square root of 490 563 021 is not an integer, and therefore 490 563 021 is not a square number.
The square of a number (here 490 563 021) is the result of the product of this number (490 563 021) by itself (i.e., 490 563 021 × 490 563 021); the square of 490 563 021 is sometimes called "raising 490 563 021 to the power 2", or "490 563 021 squared".
The square of 490 563 021 is 240 652 077 572 646 432 because 490 563 021 × 490 563 021 = 490 563 0212 = 240 652 077 572 646 432.
As a consequence, 490 563 021 is the square root of 240 652 077 572 646 432.
490 563 021 is a number with 9 digits.
The multiples of 490 563 021 are all integers evenly divisible by 490 563 021, that is all numbers such that the remainder of the division by 490 563 021 is zero. There are infinitely many multiples of 490 563 021. The smallest multiples of 490 563 021 are: