It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 160 421 is not a prime number.
For example, 160 421 can be divided by 59: 160 421 / 59 = 2 719.
For 160 421 to be a prime number, it would have been required that 160 421 has only two divisors, i.e., itself and 1.
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160 421 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 160 421 is about 400.526.
Thus, the square root of 160 421 is not an integer, and therefore 160 421 is not a square number.
The square of a number (here 160 421) is the result of the product of this number (160 421) by itself (i.e., 160 421 × 160 421); the square of 160 421 is sometimes called "raising 160 421 to the power 2", or "160 421 squared".
The square of 160 421 is 25 734 897 241 because 160 421 × 160 421 = 160 4212 = 25 734 897 241.
As a consequence, 160 421 is the square root of 25 734 897 241.
The multiples of 160 421 are all integers evenly divisible by 160 421, that is all numbers such that the remainder of the division by 160 421 is zero. There are infinitely many multiples of 160 421. The smallest multiples of 160 421 are: