It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 490 721 is not a prime number.
For example, 490 721 can be divided by 7: 490 721 / 7 = 70 103.
For 490 721 to be a prime number, it would have been required that 490 721 has only two divisors, i.e., itself and 1.
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490 721 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 490 721 is about 700.515.
Thus, the square root of 490 721 is not an integer, and therefore 490 721 is not a square number.
The square of a number (here 490 721) is the result of the product of this number (490 721) by itself (i.e., 490 721 × 490 721); the square of 490 721 is sometimes called "raising 490 721 to the power 2", or "490 721 squared".
The square of 490 721 is 240 807 099 841 because 490 721 × 490 721 = 490 7212 = 240 807 099 841.
As a consequence, 490 721 is the square root of 240 807 099 841.
The multiples of 490 721 are all integers evenly divisible by 490 721, that is all numbers such that the remainder of the division by 490 721 is zero. There are infinitely many multiples of 490 721. The smallest multiples of 490 721 are: