It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 160 721 is not a prime number.
For example, 160 721 can be divided by 11: 160 721 / 11 = 14 611.
For 160 721 to be a prime number, it would have been required that 160 721 has only two divisors, i.e., itself and 1.
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160 721 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 160 721 is about 400.900.
Thus, the square root of 160 721 is not an integer, and therefore 160 721 is not a square number.
The square of a number (here 160 721) is the result of the product of this number (160 721) by itself (i.e., 160 721 × 160 721); the square of 160 721 is sometimes called "raising 160 721 to the power 2", or "160 721 squared".
The square of 160 721 is 25 831 239 841 because 160 721 × 160 721 = 160 7212 = 25 831 239 841.
As a consequence, 160 721 is the square root of 25 831 239 841.
The multiples of 160 721 are all integers evenly divisible by 160 721, that is all numbers such that the remainder of the division by 160 721 is zero. There are infinitely many multiples of 160 721. The smallest multiples of 160 721 are: