It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 400 138 202 is not a prime number.
For example, 400 138 202 can be divided by 2: 400 138 202 / 2 = 200 069 101.
For 400 138 202 to be a prime number, it would have been required that 400 138 202 has only two divisors, i.e., itself and 1.
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400 138 202 is an even number, because it is evenly divisible by 2: 400 138 202 / 2 = 200 069 101.
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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 400 138 202 is about 20 003.455.
Thus, the square root of 400 138 202 is not an integer, and therefore 400 138 202 is not a square number.
The square of a number (here 400 138 202) is the result of the product of this number (400 138 202) by itself (i.e., 400 138 202 × 400 138 202); the square of 400 138 202 is sometimes called "raising 400 138 202 to the power 2", or "400 138 202 squared".
The square of 400 138 202 is 160 110 580 699 792 800 because 400 138 202 × 400 138 202 = 400 138 2022 = 160 110 580 699 792 800.
As a consequence, 400 138 202 is the square root of 160 110 580 699 792 800.
400 138 202 is a number with 9 digits.
The multiples of 400 138 202 are all integers evenly divisible by 400 138 202, that is all numbers such that the remainder of the division by 400 138 202 is zero. There are infinitely many multiples of 400 138 202. The smallest multiples of 400 138 202 are: