It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 130 321 is not a prime number.
For example, 130 321 can be divided by 19: 130 321 / 19 = 6 859.
For 130 321 to be a prime number, it would have been required that 130 321 has only two divisors, i.e., itself and 1.
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130 321 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 130 321 is 361.
Therefore, the square root of 130 321 is an integer, and as a consequence 130 321 is a perfect square.
The square of a number (here 130 321) is the result of the product of this number (130 321) by itself (i.e., 130 321 × 130 321); the square of 130 321 is sometimes called "raising 130 321 to the power 2", or "130 321 squared".
The square of 130 321 is 16 983 563 041 because 130 321 × 130 321 = 130 3212 = 16 983 563 041.
As a consequence, 130 321 is the square root of 16 983 563 041.
The multiples of 130 321 are all integers evenly divisible by 130 321, that is all numbers such that the remainder of the division by 130 321 is zero. There are infinitely many multiples of 130 321. The smallest multiples of 130 321 are: