It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 978 138 638 is not a prime number.
For example, 978 138 638 can be divided by 2: 978 138 638 / 2 = 489 069 319.
For 978 138 638 to be a prime number, it would have been required that 978 138 638 has only two divisors, i.e., itself and 1.
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978 138 638 is an even number, because it is evenly divisible by 2: 978 138 638 / 2 = 489 069 319.
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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 978 138 638 is about 31 275.208.
Thus, the square root of 978 138 638 is not an integer, and therefore 978 138 638 is not a square number.
The square of a number (here 978 138 638) is the result of the product of this number (978 138 638) by itself (i.e., 978 138 638 × 978 138 638); the square of 978 138 638 is sometimes called "raising 978 138 638 to the power 2", or "978 138 638 squared".
The square of 978 138 638 is 956 755 195 148 495 104 because 978 138 638 × 978 138 638 = 978 138 6382 = 956 755 195 148 495 104.
As a consequence, 978 138 638 is the square root of 956 755 195 148 495 104.
978 138 638 is a number with 9 digits.
The multiples of 978 138 638 are all integers evenly divisible by 978 138 638, that is all numbers such that the remainder of the division by 978 138 638 is zero. There are infinitely many multiples of 978 138 638. The smallest multiples of 978 138 638 are: