It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 400 878 024 is not a prime number.
For example, 400 878 024 can be divided by 2: 400 878 024 / 2 = 200 439 012.
For 400 878 024 to be a prime number, it would have been required that 400 878 024 has only two divisors, i.e., itself and 1.
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400 878 024 is an even number, because it is evenly divisible by 2: 400 878 024 / 2 = 200 439 012.
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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 400 878 024 is about 20 021.939.
Thus, the square root of 400 878 024 is not an integer, and therefore 400 878 024 is not a square number.
The square of a number (here 400 878 024) is the result of the product of this number (400 878 024) by itself (i.e., 400 878 024 × 400 878 024); the square of 400 878 024 is sometimes called "raising 400 878 024 to the power 2", or "400 878 024 squared".
The square of 400 878 024 is 160 703 190 126 144 576 because 400 878 024 × 400 878 024 = 400 878 0242 = 160 703 190 126 144 576.
As a consequence, 400 878 024 is the square root of 160 703 190 126 144 576.
400 878 024 is a number with 9 digits.
The multiples of 400 878 024 are all integers evenly divisible by 400 878 024, that is all numbers such that the remainder of the division by 400 878 024 is zero. There are infinitely many multiples of 400 878 024. The smallest multiples of 400 878 024 are: