It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 490 642 is not a prime number.
For example, 490 642 can be divided by 2: 490 642 / 2 = 245 321.
For 490 642 to be a prime number, it would have been required that 490 642 has only two divisors, i.e., itself and 1.
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490 642 is an even number, because it is evenly divisible by 2: 490 642 / 2 = 245 321.
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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 490 642 is about 700.458.
Thus, the square root of 490 642 is not an integer, and therefore 490 642 is not a square number.
The square of a number (here 490 642) is the result of the product of this number (490 642) by itself (i.e., 490 642 × 490 642); the square of 490 642 is sometimes called "raising 490 642 to the power 2", or "490 642 squared".
The square of 490 642 is 240 729 572 164 because 490 642 × 490 642 = 490 6422 = 240 729 572 164.
As a consequence, 490 642 is the square root of 240 729 572 164.
The multiples of 490 642 are all integers evenly divisible by 490 642, that is all numbers such that the remainder of the division by 490 642 is zero. There are infinitely many multiples of 490 642. The smallest multiples of 490 642 are: