It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 000 489 is not a prime number.
For example, 402 000 489 can be divided by 3: 402 000 489 / 3 = 134 000 163.
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For 402 000 489 to be a prime number, it would have been required that 402 000 489 has only two divisors, i.e., itself and 1.
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402 000 489 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 402 000 489 is about 20 049.950.
Thus, the square root of 402 000 489 is not an integer, and therefore 402 000 489 is not a square number.
The square of a number (here 402 000 489) is the result of the product of this number (402 000 489) by itself (i.e., 402 000 489 × 402 000 489); the square of 402 000 489 is sometimes called "raising 402 000 489 to the power 2", or "402 000 489 squared".
The square of 402 000 489 is 161 604 393 156 239 136 because 402 000 489 × 402 000 489 = 402 000 4892 = 161 604 393 156 239 136.
As a consequence, 402 000 489 is the square root of 161 604 393 156 239 136.
402 000 489 is a number with 9 digits.
The multiples of 402 000 489 are all integers evenly divisible by 402 000 489, that is all numbers such that the remainder of the division by 402 000 489 is zero. There are infinitely many multiples of 402 000 489. The smallest multiples of 402 000 489 are: