It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 400 671 423 is not a prime number.
For example, 400 671 423 can be divided by 3: 400 671 423 / 3 = 133 557 141.
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For 400 671 423 to be a prime number, it would have been required that 400 671 423 has only two divisors, i.e., itself and 1.
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400 671 423 is an odd number, because it is not evenly divisible by 2.
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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 400 671 423 is about 20 016.779.
Thus, the square root of 400 671 423 is not an integer, and therefore 400 671 423 is not a square number.
The square of a number (here 400 671 423) is the result of the product of this number (400 671 423) by itself (i.e., 400 671 423 × 400 671 423); the square of 400 671 423 is sometimes called "raising 400 671 423 to the power 2", or "400 671 423 squared".
The square of 400 671 423 is 160 537 589 208 844 928 because 400 671 423 × 400 671 423 = 400 671 4232 = 160 537 589 208 844 928.
As a consequence, 400 671 423 is the square root of 160 537 589 208 844 928.
400 671 423 is a number with 9 digits.
The multiples of 400 671 423 are all integers evenly divisible by 400 671 423, that is all numbers such that the remainder of the division by 400 671 423 is zero. There are infinitely many multiples of 400 671 423. The smallest multiples of 400 671 423 are: