It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 420 427 is not a prime number.
For example, 420 427 can be divided by 7: 420 427 / 7 = 60 061.
For 420 427 to be a prime number, it would have been required that 420 427 has only two divisors, i.e., itself and 1.
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420 427 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 420 427 is about 648.403.
Thus, the square root of 420 427 is not an integer, and therefore 420 427 is not a square number.
The square of a number (here 420 427) is the result of the product of this number (420 427) by itself (i.e., 420 427 × 420 427); the square of 420 427 is sometimes called "raising 420 427 to the power 2", or "420 427 squared".
The square of 420 427 is 176 758 862 329 because 420 427 × 420 427 = 420 4272 = 176 758 862 329.
As a consequence, 420 427 is the square root of 176 758 862 329.
The multiples of 420 427 are all integers evenly divisible by 420 427, that is all numbers such that the remainder of the division by 420 427 is zero. There are infinitely many multiples of 420 427. The smallest multiples of 420 427 are: