It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 162 161 is not a prime number.
For example, 162 161 can be divided by 31: 162 161 / 31 = 5 231.
For 162 161 to be a prime number, it would have been required that 162 161 has only two divisors, i.e., itself and 1.
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162 161 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 162 161 is about 402.692.
Thus, the square root of 162 161 is not an integer, and therefore 162 161 is not a square number.
The square of a number (here 162 161) is the result of the product of this number (162 161) by itself (i.e., 162 161 × 162 161); the square of 162 161 is sometimes called "raising 162 161 to the power 2", or "162 161 squared".
The square of 162 161 is 26 296 189 921 because 162 161 × 162 161 = 162 1612 = 26 296 189 921.
As a consequence, 162 161 is the square root of 26 296 189 921.
The multiples of 162 161 are all integers evenly divisible by 162 161, that is all numbers such that the remainder of the division by 162 161 is zero. There are infinitely many multiples of 162 161. The smallest multiples of 162 161 are: