It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 490 561 138 is not a prime number.
For example, 490 561 138 can be divided by 2: 490 561 138 / 2 = 245 280 569.
For 490 561 138 to be a prime number, it would have been required that 490 561 138 has only two divisors, i.e., itself and 1.
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490 561 138 is an even number, because it is evenly divisible by 2: 490 561 138 / 2 = 245 280 569.
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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 490 561 138 is about 22 148.615.
Thus, the square root of 490 561 138 is not an integer, and therefore 490 561 138 is not a square number.
The square of a number (here 490 561 138) is the result of the product of this number (490 561 138) by itself (i.e., 490 561 138 × 490 561 138); the square of 490 561 138 is sometimes called "raising 490 561 138 to the power 2", or "490 561 138 squared".
The square of 490 561 138 is 240 650 230 115 855 040 because 490 561 138 × 490 561 138 = 490 561 1382 = 240 650 230 115 855 040.
As a consequence, 490 561 138 is the square root of 240 650 230 115 855 040.
490 561 138 is a number with 9 digits.
The multiples of 490 561 138 are all integers evenly divisible by 490 561 138, that is all numbers such that the remainder of the division by 490 561 138 is zero. There are infinitely many multiples of 490 561 138. The smallest multiples of 490 561 138 are: