It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 400 374 is not a prime number.
For example, 400 374 can be divided by 2: 400 374 / 2 = 200 187.
For 400 374 to be a prime number, it would have been required that 400 374 has only two divisors, i.e., itself and 1.
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400 374 is an even number, because it is evenly divisible by 2: 400 374 / 2 = 200 187.
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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 400 374 is about 632.751.
Thus, the square root of 400 374 is not an integer, and therefore 400 374 is not a square number.
The square of a number (here 400 374) is the result of the product of this number (400 374) by itself (i.e., 400 374 × 400 374); the square of 400 374 is sometimes called "raising 400 374 to the power 2", or "400 374 squared".
The square of 400 374 is 160 299 339 876 because 400 374 × 400 374 = 400 3742 = 160 299 339 876.
As a consequence, 400 374 is the square root of 160 299 339 876.
The multiples of 400 374 are all integers evenly divisible by 400 374, that is all numbers such that the remainder of the division by 400 374 is zero. There are infinitely many multiples of 400 374. The smallest multiples of 400 374 are: