It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 425 609 is not a prime number.
For example, 402 425 609 can be divided by 47: 402 425 609 / 47 = 8 562 247.
For 402 425 609 to be a prime number, it would have been required that 402 425 609 has only two divisors, i.e., itself and 1.
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402 425 609 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 402 425 609 is about 20 060.549.
Thus, the square root of 402 425 609 is not an integer, and therefore 402 425 609 is not a square number.
The square of a number (here 402 425 609) is the result of the product of this number (402 425 609) by itself (i.e., 402 425 609 × 402 425 609); the square of 402 425 609 is sometimes called "raising 402 425 609 to the power 2", or "402 425 609 squared".
The square of 402 425 609 is 161 946 370 779 020 896 because 402 425 609 × 402 425 609 = 402 425 6092 = 161 946 370 779 020 896.
As a consequence, 402 425 609 is the square root of 161 946 370 779 020 896.
402 425 609 is a number with 9 digits.
The multiples of 402 425 609 are all integers evenly divisible by 402 425 609, that is all numbers such that the remainder of the division by 402 425 609 is zero. There are infinitely many multiples of 402 425 609. The smallest multiples of 402 425 609 are: