What is a prime number out of 465 822 600 743

A prime number cannot have non-trivial divisors (i.e. 1 and itself).

465 ends with 5, so it is a multiple of 5, and is not prime.

822 and 600 end with an even digit, so they are even, and thus multiple of 2, and so they are not prime.

So, the prime number among these is 743.