It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 401 978 388 is not a prime number.
For example, 401 978 388 can be divided by 2: 401 978 388 / 2 = 200 989 194.
For 401 978 388 to be a prime number, it would have been required that 401 978 388 has only two divisors, i.e., itself and 1.
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401 978 388 is an even number, because it is evenly divisible by 2: 401 978 388 / 2 = 200 989 194.
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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 401 978 388 is about 20 049.399.
Thus, the square root of 401 978 388 is not an integer, and therefore 401 978 388 is not a square number.
The square of a number (here 401 978 388) is the result of the product of this number (401 978 388) by itself (i.e., 401 978 388 × 401 978 388); the square of 401 978 388 is sometimes called "raising 401 978 388 to the power 2", or "401 978 388 squared".
The square of 401 978 388 is 161 586 624 419 078 528 because 401 978 388 × 401 978 388 = 401 978 3882 = 161 586 624 419 078 528.
As a consequence, 401 978 388 is the square root of 161 586 624 419 078 528.
401 978 388 is a number with 9 digits.
The multiples of 401 978 388 are all integers evenly divisible by 401 978 388, that is all numbers such that the remainder of the division by 401 978 388 is zero. There are infinitely many multiples of 401 978 388. The smallest multiples of 401 978 388 are: