It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 490 198 978 is not a prime number.
For example, 490 198 978 can be divided by 2: 490 198 978 / 2 = 245 099 489.
For 490 198 978 to be a prime number, it would have been required that 490 198 978 has only two divisors, i.e., itself and 1.
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490 198 978 is an even number, because it is evenly divisible by 2: 490 198 978 / 2 = 245 099 489.
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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 490 198 978 is about 22 140.438.
Thus, the square root of 490 198 978 is not an integer, and therefore 490 198 978 is not a square number.
The square of a number (here 490 198 978) is the result of the product of this number (490 198 978) by itself (i.e., 490 198 978 × 490 198 978); the square of 490 198 978 is sometimes called "raising 490 198 978 to the power 2", or "490 198 978 squared".
The square of 490 198 978 is 240 295 038 032 244 480 because 490 198 978 × 490 198 978 = 490 198 9782 = 240 295 038 032 244 480.
As a consequence, 490 198 978 is the square root of 240 295 038 032 244 480.
490 198 978 is a number with 9 digits.
The multiples of 490 198 978 are all integers evenly divisible by 490 198 978, that is all numbers such that the remainder of the division by 490 198 978 is zero. There are infinitely many multiples of 490 198 978. The smallest multiples of 490 198 978 are: