It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 978 404 is not a prime number.
For example, 402 978 404 can be divided by 2: 402 978 404 / 2 = 201 489 202.
For 402 978 404 to be a prime number, it would have been required that 402 978 404 has only two divisors, i.e., itself and 1.
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402 978 404 is an even number, because it is evenly divisible by 2: 402 978 404 / 2 = 201 489 202.
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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 402 978 404 is about 20 074.322.
Thus, the square root of 402 978 404 is not an integer, and therefore 402 978 404 is not a square number.
The square of a number (here 402 978 404) is the result of the product of this number (402 978 404) by itself (i.e., 402 978 404 × 402 978 404); the square of 402 978 404 is sometimes called "raising 402 978 404 to the power 2", or "402 978 404 squared".
The square of 402 978 404 is 162 391 594 090 387 200 because 402 978 404 × 402 978 404 = 402 978 4042 = 162 391 594 090 387 200.
As a consequence, 402 978 404 is the square root of 162 391 594 090 387 200.
402 978 404 is a number with 9 digits.
The multiples of 402 978 404 are all integers evenly divisible by 402 978 404, that is all numbers such that the remainder of the division by 402 978 404 is zero. There are infinitely many multiples of 402 978 404. The smallest multiples of 402 978 404 are: