It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 960 978 is not a prime number.
For example, 402 960 978 can be divided by 2: 402 960 978 / 2 = 201 480 489.
For 402 960 978 to be a prime number, it would have been required that 402 960 978 has only two divisors, i.e., itself and 1.
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402 960 978 is an even number, because it is evenly divisible by 2: 402 960 978 / 2 = 201 480 489.
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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 402 960 978 is about 20 073.888.
Thus, the square root of 402 960 978 is not an integer, and therefore 402 960 978 is not a square number.
The square of a number (here 402 960 978) is the result of the product of this number (402 960 978) by itself (i.e., 402 960 978 × 402 960 978); the square of 402 960 978 is sometimes called "raising 402 960 978 to the power 2", or "402 960 978 squared".
The square of 402 960 978 is 162 377 549 790 716 480 because 402 960 978 × 402 960 978 = 402 960 9782 = 162 377 549 790 716 480.
As a consequence, 402 960 978 is the square root of 162 377 549 790 716 480.
402 960 978 is a number with 9 digits.
The multiples of 402 960 978 are all integers evenly divisible by 402 960 978, that is all numbers such that the remainder of the division by 402 960 978 is zero. There are infinitely many multiples of 402 960 978. The smallest multiples of 402 960 978 are: