It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 400 188 is not a prime number.
For example, 400 188 can be divided by 2: 400 188 / 2 = 200 094.
For 400 188 to be a prime number, it would have been required that 400 188 has only two divisors, i.e., itself and 1.
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400 188 is an even number, because it is evenly divisible by 2: 400 188 / 2 = 200 094.
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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 400 188 is about 632.604.
Thus, the square root of 400 188 is not an integer, and therefore 400 188 is not a square number.
The square of a number (here 400 188) is the result of the product of this number (400 188) by itself (i.e., 400 188 × 400 188); the square of 400 188 is sometimes called "raising 400 188 to the power 2", or "400 188 squared".
The square of 400 188 is 160 150 435 344 because 400 188 × 400 188 = 400 1882 = 160 150 435 344.
As a consequence, 400 188 is the square root of 160 150 435 344.
The multiples of 400 188 are all integers evenly divisible by 400 188, that is all numbers such that the remainder of the division by 400 188 is zero. There are infinitely many multiples of 400 188. The smallest multiples of 400 188 are: